Unknown in Addition & Subtraction
Determine the unknown whole number in an addition or subtraction equation relating three whole numbers
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Teaching Table · Plan outline
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“If your child sees '? + 6 = 14' or '9 − ? = 4' written on paper, can they figure out what number goes in the gap?”
Full guide and materials
- Activity. Determine the unknown whole number in an addition or subtraction equation relating three whole numbers
What to notice. Solve 8 + ? = 11 and write 3 • Solve 5 = □ − 3 and write 8 • Solve 6 + 6 = □ and write 12
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If your child sees '? + 6 = 14' or '9 − ? = 4' written on paper, can they figure out what number goes in the gap?
Determine the unknown whole number in an addition or subtraction equation relating three whole numbers
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Check understanding
- Solve 8 + ? = 11 and write 3
- Solve 5 = □ − 3 and write 8
- Solve 6 + 6 = □ and write 12
“If your child sees '? + 6 = 14' or '9 − ? = 4' written on paper, can they figure out what number goes in the gap?”
Curriculum record
- Type
- Procedural
- Subject
- Mathematics
- Domain
- Addition & Subtraction
- Age range
- Ages 6–7
Standards