Math
Math guides,
worked all the way.
Every guide here does the same three things: shows the method, works real numbers through it, and names the mistake that costs the marks. No sign-up, no paywall on the steps.
Guides
How to Solve Proportions, Step by Step
A proportion is two equal ratios. Cross multiply, solve, and check the units line up. Three worked examples, the common mistakes, and practice with answers.
How to Find a Percentage
Percent of a number, what percent one number is of another, and percentage change. Three formulas, three worked examples, and the mistakes that flip the answer.
What this covers
- Percentages, averages, and ratios
- Proportions and scaling
- The arithmetic that everything later depends on
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