Adding Doubles Strategy Worksheets With Answer Keys Page 12
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20Adding Doubles Strategy (F) Answers
Use an adding doubles strategy to find each sum
Example: 9 + 10 = 9 + 9 + 1 = 18 + 1 = 19
9 + 11 =
0 + 1 =
6 + 5 =
9 + 9 + 2 = 20
0 + 0 + 1 = 1
6 + 6 - 1 = 11
18 + 2 = 20
0 + 1 = 1
12 - 1 = 11
4 + 2 =
9 + 9 =
0 + 1 =
4 + 4 - 2 = 6
9 + 9 = 18
0 + 0 + 1 = 1
8 - 2 = 6
0 + 1 = 1
6 + 6 =
5 + 7 =
9 + 9 =
6 + 6 = 12
5 + 5 + 2 = 12
9 + 9 = 18
10 + 2 = 12
2 + 0 =
5 + 4 =
1 + 3 =
2 + 2 - 2 = 2
5 + 5 - 1 = 9
1 + 1 + 2 = 4
4 - 2 = 2
10 - 1 = 9
2 + 2 = 4
5 + 5 =
7 + 8 =
3 + 3 =
5 + 5 = 10
7 + 7 + 1 = 15
3 + 3 = 6
14 + 1 = 15
7 + 7 =
6 + 7 =
5 + 4 =
7 + 7 = 14
6 + 6 + 1 = 13
5 + 5 - 1 = 9
12 + 1 = 13
10 - 1 = 9
3 + 3 =
9 + 8 =
6 + 8 =
3 + 3 = 6
9 + 9 - 1 = 17
6 + 6 + 2 = 14
18 - 1 = 17
12 + 2 = 14
1 + 2 =
5 + 3 =
8 + 10 =
1 + 1 + 1 = 3
5 + 5 - 2 = 8
8 + 8 + 2 = 18
2 + 1 = 3
10 - 2 = 8
16 + 2 = 18
4 + 6 =
1 + 2 =
3 + 2 =
4 + 4 + 2 = 10
1 + 1 + 1 = 3
3 + 3 - 1 = 5
8 + 2 = 10
2 + 1 = 3
6 - 1 = 5
8 + 9 =
4 + 2 =
7 + 8 =
8 + 8 + 1 = 17
4 + 4 - 2 = 6
7 + 7 + 1 = 15
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