Place Value Basics
Inequality symbols are your best mates for comparing numbers. Remember: < means "less than", > means "greater than", and you can add the line underneath (≤ or ≥) when things are equal too.
Rounding decimals is dead simple once you know the trick. Count to your decimal place, then look at the next digit. If it's 0-4, round down; if it's 5-9, round up. So 0.317 rounded to 1 decimal place becomes 0.3.
Negative numbers follow predictable patterns when you add or subtract them. Same signs always give positive answers (+ and + = +, or - and - = +), whilst different signs give negative answers (+ and - = -, or - and + = -).
Top Tip: When multiplying or dividing with negative numbers, use the same rule - same signs = positive answer, different signs = negative answer!
