Making a whole with decimals
21 October 2026
Why this skill matters
Understanding how to make a whole using decimals is important for 11+ maths. It helps children develop number sense and prepares them for more advanced questions.
Step 1: Present the problem
What number must be added to 0.75 to make a whole
Step 2: Remember what a whole is
A whole is 1.00 in decimal form.
Step 3: Find the missing part
Subtract the decimal from 1.00:
1.00 - 0.75 = 0.25
Step 4: State the answer
The correct answer is 0.25.
Key insight: Making a whole using decimals means finding the difference between the decimal number and 1.
Encourage regular practice
Try similar questions with different decimals. Regular practice will help your child spot patterns and build confidence with decimals.
