11+ Maths: Finding Percentages of Quantities Practice
21 October 2026
Why percentages of quantities matter
Understanding how to find percentages of quantities is a key skill for the 11+ maths exam. This topic comes up often in both calculation and word problems, so it is important that children feel confident with the steps.
What does finding a percentage mean
To find a percentage of a quantity means to work out a part of the whole. For example, finding 25% of 80 means working out what 25 out of every 100 parts of 80 would be.
Worked example
Find 25% of 80
Step 1: Change the percentage to a decimal. 25% is the same as 0.25.
Step 2: Multiply the decimal by the quantity. 0.25 × 80 = 20.
The correct answer is 20.
Step-by-step approach
First, write the percentage as a decimal. You do this by dividing by 100. For example, 25% becomes 0.25.
Next, multiply the decimal by the amount you are working with. This gives you the part of the quantity that matches the percentage.
Check the answer
After multiplying, look at your result and check if it makes sense. For 25% of 80, the answer is 20, which is a quarter of 80.
Key insight: Finding percentages of quantities is a core part of the 11+ exam, and being able to break the process into small steps helps children solve both simple and more complex questions with confidence.
