Grade 1 maths · C.3 · Addition and Subtraction to 20
Find the missing number to 20
Find the number that goes in the box.
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□ + 6 = 9 What number goes in the box?
Answer: 3
5 + □ = 10 What number goes in the box?
Answer: 5
□ + 4 = 10 What number goes in the box?
Answer: 6
Tip: Find the number that goes in the box.
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Curriculum
Common Core: 1.OA.C.6, 1.OA.D.8
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