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Addition strategies: 18-20
27 cards·by kassy4
mathaddition
18+1
19
18+2
20
18+3
21
18+4
22
18+5
23
18+6
24
18+7
25
18+8
26
18+9
27
19+1
20
19+2
21
19+3
22
19+4
23
19+5
24
19+6
25
19+7
26
19+8
27
19+9
28
20+1
21
20+2
22
20+3
23
20+4
24
20+5
25
20+6
26
20+7
27
20+8
28
20+9
29