Math · Ages 6–8 · 12 minutes

Number Bonds to 20: Find the Error

Instead of only producing answers, learners act as math detectives and use drawings or equations to repair incorrect number bonds.

Student name

BrightPath

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Today I am practising: checking whether parts correctly compose a whole

A bond says 7 + 6 = 14. Find and repair the error.

A bond says 10 + 9 = 20. What should the whole be?

A bond says 15 is split into 8 and 8. Change one part so it is true.

A bond says 12 = 5 + 7. Mark it correct or incorrect and prove it.

A bond says 20 = 11 + 9. Mark it correct or incorrect and explain.

Write one tricky incorrect bond for an adult to check, then write its correction.

Grown-up note: Ask your learner to explain one answer in their own words.

For the grown-up

How to teach this page

Step 1Ask the child to verify with counters or a drawing before announcing an answer.
Step 2Treat correct bonds as evidence to explain, not items to skip.
Step 3For an incorrect bond, change only one number at a time to keep the repair focused.