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Addition strategies: 15+..., to 17+...
add the two numbers together and then add 10
21 cards·by kassy4
mathaddition
15+4
19
15+5
20
15+6
21
15+7
22
15+8
23
15+9
24
16+3
19
16+4
20
16+5
21
16+6
22
16+7
23
16+8
24
16+9
25
17+3
20
17+4
21
17+5
22
17+6
23
17+7
24
17+8
25
17+9
26
15+3
18