Grade 1 math · A.3 · Addition and Subtraction to 20
Find the missing number to 20
See worked examples
□ + 11 = 17 What number goes in the box?
Answer: 6
□ − 9 = 10 What number goes in the box?
Answer: 19
□ + 8 = 20 What number goes in the box?
Answer: 12
Curriculum
Common Core: 1.OA.C.6, 1.OA.D.8
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