Adding Doubles Minus 1 (A-J) Math Worksheet With Answers Page 6
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20Adding Doubles Minus 1 (C) Answers
Use an adding doubles strategy to find each sum
Example: 2 + 1 = 2 + 2 - 1 = 4 - 1 = 3
6 + 5 =
6 + 5 =
3 + 2 =
6 + 6 - 1 = 11
6 + 6 - 1 = 11
3 + 3 - 1 = 5
12 - 1 = 11
12 - 1 = 11
6 - 1 = 5
2 + 1 =
1 + 0 =
8 + 7 =
2 + 2 - 1 = 3
1 + 1 - 1 = 1
8 + 8 - 1 = 15
4 - 1 = 3
2 - 1 = 1
16 - 1 = 15
4 + 3 =
3 + 2 =
10 + 9 =
4 + 4 - 1 = 7
3 + 3 - 1 = 5
10 + 10 - 1 = 19
8 - 1 = 7
6 - 1 = 5
20 - 1 = 19
5 + 4 =
10 + 9 =
9 + 8 =
5 + 5 - 1 = 9
10 + 10 - 1 = 19
9 + 9 - 1 = 17
10 - 1 = 9
20 - 1 = 19
18 - 1 = 17
3 + 2 =
9 + 8 =
1 + 0 =
3 + 3 - 1 = 5
9 + 9 - 1 = 17
1 + 1 - 1 = 1
6 - 1 = 5
18 - 1 = 17
2 - 1 = 1
1 + 0 =
4 + 3 =
7 + 6 =
1 + 1 - 1 = 1
4 + 4 - 1 = 7
7 + 7 - 1 = 13
2 - 1 = 1
8 - 1 = 7
14 - 1 = 13
9 + 8 =
8 + 7 =
5 + 4 =
9 + 9 - 1 = 17
8 + 8 - 1 = 15
5 + 5 - 1 = 9
18 - 1 = 17
16 - 1 = 15
10 - 1 = 9
7 + 6 =
2 + 1 =
2 + 1 =
7 + 7 - 1 = 13
2 + 2 - 1 = 3
2 + 2 - 1 = 3
14 - 1 = 13
4 - 1 = 3
4 - 1 = 3
8 + 7 =
5 + 4 =
6 + 5 =
8 + 8 - 1 = 15
5 + 5 - 1 = 9
6 + 6 - 1 = 11
16 - 1 = 15
10 - 1 = 9
12 - 1 = 11
10 + 9 =
7 + 6 =
4 + 3 =
10 + 10 - 1 = 19
7 + 7 - 1 = 13
4 + 4 - 1 = 7
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