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Addition strategies: doubles +1
When the numbers are the same think of the doubles and add 1
11 cards·by kassy4
mathaddition
1+2
3
2+3
5
3+4
7
4+5
9
5+6
11
6+7
13
7+8
15
8+9
17
9+10
19
10+11
21
11+12
23