11+ Maths: Solving Missing Number Calculations
19 October 2026
What are missing number calculations
Missing number calculations are questions where one part of an equation is left blank, and your child must work out what goes there. These appear in addition, subtraction, multiplication and division, and are a regular feature in 11+ maths exams.
Why these questions matter
Finding a missing number is not just about memorising facts. It encourages children to think flexibly, use inverse operations, and understand the structure of equations. This skill is crucial for later algebra and problem solving.
Ways to practise at home
Try writing out equations with a blank for your child to fill in, such as □ + 7 = 15 or 24 − □ = 9. Encourage your child to talk through their thinking. What operation would help, and how can they check their answer?
Key insight: Focus on reasoning, not guessing
Encourage your child to use what they know about number bonds and inverse operations. For example, if □ × 6 = 42, thinking 'what times 6 gives 42?' is using division as the inverse. This approach builds confidence and accuracy.
Moving beyond simple addition and subtraction
For 11+ preparation, children may meet missing numbers in more complex settings, including multiplication, division, and two-step problems. Regular practice with a mix of questions helps build versatility.
Using online interactive practice
Interactive worksheets, like those on EEZY BREEZY MATHS, give instant feedback and a variety of question types. This helps children spot patterns and learn from mistakes in a calm, supportive way.
Supporting your child positively
Mistakes are part of learning. When your child gets stuck, ask questions like 'What do you know already?' or 'What could you try next?' Calm encouragement helps them develop resilience and problem-solving habits.
