How to solve percentages & ratios

Math & Logic

Reason about parts, proportions, and percentage change without a calculator.

Worked examples

Answers shown

Follow the steps on real items before you practise.

Example 1Difficulty 2

What is 15% of 240?

Answer: D. Here is why:

10% of 240 is 24, and 5% is 12. 24 + 12 = 36.

Example 2Difficulty 3

A jacket priced at 80 is reduced by 25%. What is the sale price?

Answer: C. Here is why:

25% of 80 is 20. 80 - 20 = 60.