Common Core: 1.OA — Operations & Algebraic Thinking
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Name
Date
Score
/ 10
Bonds of 20 (Set E)
Directions: Find the missing number in each bond.
1.
15 + ? = 20
2.
16 + ? = 20
3.
? + 3 = 20
4.
? + 2 = 20
5.
18 + 2 = ?
6.
19 + 1 = ?
7.
1 + ? = 20
8.
2 + ? = 20
9.
? + 18 = 20
10.
? + 17 = 20
Great work — check your answers when you finish.
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