11+ Maths: Converting between decimals and percentages practice
19 October 2026
Understanding decimals and percentages
Decimals and percentages are two ways of expressing parts of a whole. For the 11+ exam, children need to recognise that a decimal like 0.75 means 75 out of 100, or 75%. This skill is essential for many problem-solving questions.
How to convert decimals to percentages
To change a decimal into a percentage, multiply the decimal by 100 and add the percent sign. For example, 0.4 × 100 = 40%. Encourage your child to practise with different decimals, such as 0.25 (25%) or 0.6 (60%).
Key insight: Spotting the link between the decimal and the percentage helps children check their answers quickly.
How to convert percentages to decimals
To turn a percentage into a decimal, divide the number by 100. For instance, 80% ÷ 100 = 0.8. Remind your child that the decimal will always be less than or equal to 1 when converting from a percentage.
Common mistakes and practice tips
Children sometimes forget to move the decimal point or mix up the direction of conversion. Practise both ways, and use real-life examples like test scores or sale prices to make the process more familiar. Regular practice with a variety of numbers builds confidence.
Key insight: Using everyday examples makes the concept more concrete and memorable for children.
Supporting your child at home
Encourage your child to explain their steps out loud as they work through conversions. This helps them spot errors and deepen their understanding. Short, frequent practice sessions are often more effective than long study periods.
