11 Plus Decimals Practice: Making a Whole Explained
19 October 2026
Making a whole with decimals
Many 11+ maths questions ask children to find two or more decimals that add up to a whole number, such as 1 or 10. This skill helps build confidence with place value and prepares your child for more advanced problem solving.
Why this matters for 11+
Understanding how decimals combine to make a whole is key for arithmetic and word problems. It also comes up in fraction and percentage work, so regular practice is essential for steady progress.
How to practise at home
Start with pairs like 0.3 + 0.7 or 0.45 + 0.55. Encourage your child to look for patterns. Notice how the digits in the tenths or hundredths places combine to make 10 or 100. Use vertical layout and line up decimal points to avoid mistakes.
Common errors to watch for
Key insight: Children often misalign decimal points or forget to use placeholder zeros. Remind them to write numbers such as 0.6 as 0.60 if working with hundredths, and always check the total adds exactly to a whole number.
Checking answers
After completing a sum, ask your child to estimate the answer before checking their calculation. If the result is slightly above or below a whole, encourage them to look for a small error in place value or carrying.
Next steps in decimal practice
Once your child is confident making a whole with two decimals, try three or more numbers, or mix in subtraction to find missing parts. This builds flexible thinking and prepares them for 11+ reasoning questions.
