Adding Doubles Minus 1 (B) Single Digit Addition Worksheet With Answer Key Page 2

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

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