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