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Tallula Walker
01/12/2025
Maths
GCSE Maths Pearson Edexcel notes
840
•
1 Dec 2025
•
GCSE Maths Revision Notes for Pearson Edexcel
Tallula Walker
@tawkforvoiceless
1 / 10
Solving Exponential Equations
Ever wondered how to tackle those tricky equations with x in the power? The secret is making sure both sides have the same base number.
When the bases match, you can ignore them completely and just solve the powers. For example, if you have 3^ = 3^2, then x-4 = 2, so x = 6. It's that simple!
Sometimes you'll need to convert different bases first. Like changing 25 to 5² so everything matches. Once the bases are identical, drop them and solve the equation that's left.
Quick Tip: Always check if you can rewrite numbers as powers of the same base - 81 = 3⁴, 27 = 3³, etc.
Indices Rules
Think of indices (or powers) like a mathematical shortcut - they tell you how many times to multiply a number by itself.
The power of a power rule says ^b = x^(ab). Just multiply the powers together. When multiplying with the same base, add the powers: x^a × x^b = x^. For division, subtract them: x^a ÷ x^b = x^.
Negative and fractional indices might look scary, but they're not. A negative power means "one over": x^ = 1/x^a. Fractional powers are roots - x^(1/2) is the square root, x^(1/3) is the cube root.
Memory Trick: BIDMAS applies to indices too - always sort out the powers before other operations!
Surds
Surds are just square roots that can't be simplified to whole numbers - think √2 or √3.
Adding surds works like adding fractions - you need the same "denominator" (the number under the root). So 3√8 + 4√8 = 7√8. If they're different, simplify first: √18 = 3√2, so you can then add them properly.
Multiplying surds is easier - just multiply everything together. √4 × √2 = √8. To rationalise the denominator (get rid of surds on the bottom), multiply top and bottom by the same surd.
Pro Tip: Always look for perfect square factors when simplifying - √20 = √(4×5) = 2√5.
Exact Trig Values
You absolutely need to memorise the exact trigonometric values for 30°, 45°, 60°, and 90°. These pop up everywhere in exams!
The key angles give you exact fractions instead of messy decimals. For 30°: sin = 1/2, cos = √3/2, tan = 1/√3. For 45°: sin = cos = √2/2, tan = 1. For 60°: sin = √3/2, cos = 1/2, tan = √3.
Using exact values makes calculations much cleaner. If you need to find a side length and you know an angle is 30°, you can work with exact fractions throughout your solution.
Memory Aid: Draw a right-angled triangle with angles 30°, 60°, 90° and sides 1, 2, √3 to remember the ratios!
Bearings and Trigonometry
Bearings always start from North, go clockwise, and use three figures (like 045° or 270°). They're just a way of describing direction precisely.
For any triangle problem, ask yourself: "Is it right-angled?" If yes, use SOHCAHTOA. If no, you need either the sine rule or cosine rule. Use sine rule when you know a side and its opposite angle. Use cosine rule for everything else.
The sine rule is a/sin A = b/sin B = c/sin C. The cosine rule is a² = b² + c² - 2bc cos A. These formulas will be on your exam paper, so don't panic about memorising them perfectly.
Decision Tree: Right angle? → SOHCAHTOA. Not right angle + know side/opposite angle? → Sine rule. Everything else? → Cosine rule.
Solving Equations Graphically
Graphical solutions mean drawing a curve and reading off where it crosses certain lines or points.
Start by making a table of values - pick x-values in your given range and work out the corresponding y-values. Plot these points carefully, then draw a smooth curve through them (no ruler for curves!).
To solve equations like x³ - x² - 4x + 4 = 2, draw a horizontal line at y = 2 and see where it crosses your curve. The x-coordinates of these crossing points are your answers.
Graph Rules: Curves should be smooth, pass through every plotted point exactly, and have no gaps or jagged bits.
Estimating from Graphs
Reading values from curved graphs requires careful plotting and smooth curve drawing.
When solving equations graphically, you might need to draw additional lines. For x³ - x² - 4x + 4 = 0, look for where your curve crosses the x-axis .
Estimation means reading approximate values from your graph. Don't worry about being perfectly precise - examiners expect some small errors when reading from graphs. Just make sure your curve is as accurate as possible.
Quality Check: Your curve should look like it belongs in a maths textbook - smooth, continuous, and passing exactly through your plotted points.
HCF, LCM and Histograms
HCF (Highest Common Factor) and LCM (Lowest Common Multiple) problems start with prime factorisation - break numbers down to their prime factors.
Use a Venn diagram approach: put common factors in the middle, unique factors on the sides. HCF = product of middle section, LCM = product of everything. For 25 and 40: 25 = 5², 40 = 2³ × 5, so HCF = 5, LCM = 200.
Histograms show frequency density (height) against class width. Remember: frequency = frequency density × class width. The area of each bar represents the actual frequency.
Key Formula: In histograms, it's all about area - frequency density × class width = frequency.
Interest Calculations
Simple interest is straightforward - you earn the same amount each year. Formula: Interest = Principal × Rate × Time, then add to your starting amount.
Compound interest is where your interest earns interest too. Use the multiplier method: Final Amount = Start Amount × ^time. If the rate is 5% increase, multiply by 1.05. If it's 5% decrease, multiply by 0.95.
These percentage problems pop up everywhere - population growth, depreciation, inflation. The compound interest formula handles them all.
Memory Tip: Simple = same each year. Compound = grows faster because interest earns interest.
Tangent to a Circle
A tangent line touches a circle at exactly one point and meets the radius at that point at 90°.
To find a tangent's equation, first work out the gradient of the radius from the centre to the point of contact. The tangent's gradient is the negative reciprocal of this .
Use y = mx + c to find the tangent equation. You know the gradient (m) and a point it passes through, so substitute to find c. Remember that perpendicular gradients multiply to give -1.
Circle Basics: For a circle centred at origin with radius r, the equation is x² + y² = r².
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The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
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iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
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Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
GCSE Maths Revision Notes for Pearson Edexcel
Tallula Walker
@tawkforvoiceless
Maths can feel overwhelming, but these key topics are actually quite manageable once you break them down. This collection covers essential GCSE maths concepts from exponential equations and indices to trigonometry and graphs - all the stuff you'll need to... Show more
Solving Exponential Equations
Ever wondered how to tackle those tricky equations with x in the power? The secret is making sure both sides have the same base number.
When the bases match, you can ignore them completely and just solve the powers. For example, if you have 3^ = 3^2, then x-4 = 2, so x = 6. It's that simple!
Sometimes you'll need to convert different bases first. Like changing 25 to 5² so everything matches. Once the bases are identical, drop them and solve the equation that's left.
Quick Tip: Always check if you can rewrite numbers as powers of the same base - 81 = 3⁴, 27 = 3³, etc.
Sign up to see the contentIt's free!
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Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Indices Rules
Think of indices (or powers) like a mathematical shortcut - they tell you how many times to multiply a number by itself.
The power of a power rule says ^b = x^(ab). Just multiply the powers together. When multiplying with the same base, add the powers: x^a × x^b = x^. For division, subtract them: x^a ÷ x^b = x^.
Negative and fractional indices might look scary, but they're not. A negative power means "one over": x^ = 1/x^a. Fractional powers are roots - x^(1/2) is the square root, x^(1/3) is the cube root.
Memory Trick: BIDMAS applies to indices too - always sort out the powers before other operations!
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Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Surds
Surds are just square roots that can't be simplified to whole numbers - think √2 or √3.
Adding surds works like adding fractions - you need the same "denominator" (the number under the root). So 3√8 + 4√8 = 7√8. If they're different, simplify first: √18 = 3√2, so you can then add them properly.
Multiplying surds is easier - just multiply everything together. √4 × √2 = √8. To rationalise the denominator (get rid of surds on the bottom), multiply top and bottom by the same surd.
Pro Tip: Always look for perfect square factors when simplifying - √20 = √(4×5) = 2√5.
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Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Exact Trig Values
You absolutely need to memorise the exact trigonometric values for 30°, 45°, 60°, and 90°. These pop up everywhere in exams!
The key angles give you exact fractions instead of messy decimals. For 30°: sin = 1/2, cos = √3/2, tan = 1/√3. For 45°: sin = cos = √2/2, tan = 1. For 60°: sin = √3/2, cos = 1/2, tan = √3.
Using exact values makes calculations much cleaner. If you need to find a side length and you know an angle is 30°, you can work with exact fractions throughout your solution.
Memory Aid: Draw a right-angled triangle with angles 30°, 60°, 90° and sides 1, 2, √3 to remember the ratios!
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Improve your grades
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By signing up you accept Terms of Service and Privacy Policy
Bearings and Trigonometry
Bearings always start from North, go clockwise, and use three figures (like 045° or 270°). They're just a way of describing direction precisely.
For any triangle problem, ask yourself: "Is it right-angled?" If yes, use SOHCAHTOA. If no, you need either the sine rule or cosine rule. Use sine rule when you know a side and its opposite angle. Use cosine rule for everything else.
The sine rule is a/sin A = b/sin B = c/sin C. The cosine rule is a² = b² + c² - 2bc cos A. These formulas will be on your exam paper, so don't panic about memorising them perfectly.
Decision Tree: Right angle? → SOHCAHTOA. Not right angle + know side/opposite angle? → Sine rule. Everything else? → Cosine rule.
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Improve your grades
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Solving Equations Graphically
Graphical solutions mean drawing a curve and reading off where it crosses certain lines or points.
Start by making a table of values - pick x-values in your given range and work out the corresponding y-values. Plot these points carefully, then draw a smooth curve through them (no ruler for curves!).
To solve equations like x³ - x² - 4x + 4 = 2, draw a horizontal line at y = 2 and see where it crosses your curve. The x-coordinates of these crossing points are your answers.
Graph Rules: Curves should be smooth, pass through every plotted point exactly, and have no gaps or jagged bits.
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Estimating from Graphs
Reading values from curved graphs requires careful plotting and smooth curve drawing.
When solving equations graphically, you might need to draw additional lines. For x³ - x² - 4x + 4 = 0, look for where your curve crosses the x-axis .
Estimation means reading approximate values from your graph. Don't worry about being perfectly precise - examiners expect some small errors when reading from graphs. Just make sure your curve is as accurate as possible.
Quality Check: Your curve should look like it belongs in a maths textbook - smooth, continuous, and passing exactly through your plotted points.
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Improve your grades
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By signing up you accept Terms of Service and Privacy Policy
HCF, LCM and Histograms
HCF (Highest Common Factor) and LCM (Lowest Common Multiple) problems start with prime factorisation - break numbers down to their prime factors.
Use a Venn diagram approach: put common factors in the middle, unique factors on the sides. HCF = product of middle section, LCM = product of everything. For 25 and 40: 25 = 5², 40 = 2³ × 5, so HCF = 5, LCM = 200.
Histograms show frequency density (height) against class width. Remember: frequency = frequency density × class width. The area of each bar represents the actual frequency.
Key Formula: In histograms, it's all about area - frequency density × class width = frequency.
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Interest Calculations
Simple interest is straightforward - you earn the same amount each year. Formula: Interest = Principal × Rate × Time, then add to your starting amount.
Compound interest is where your interest earns interest too. Use the multiplier method: Final Amount = Start Amount × ^time. If the rate is 5% increase, multiply by 1.05. If it's 5% decrease, multiply by 0.95.
These percentage problems pop up everywhere - population growth, depreciation, inflation. The compound interest formula handles them all.
Memory Tip: Simple = same each year. Compound = grows faster because interest earns interest.
Sign up to see the contentIt's free!
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Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Tangent to a Circle
A tangent line touches a circle at exactly one point and meets the radius at that point at 90°.
To find a tangent's equation, first work out the gradient of the radius from the centre to the point of contact. The tangent's gradient is the negative reciprocal of this .
Use y = mx + c to find the tangent equation. You know the gradient (m) and a point it passes through, so substitute to find c. Remember that perpendicular gradients multiply to give -1.
Circle Basics: For a circle centred at origin with radius r, the equation is x² + y² = r².
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Most popular content: Factoring to Solve
Most popular content in Maths
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Can't find what you're looking for? Explore other subjects.
Students love us — and so will you.
4.9/5
App Store
4.8/5
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user