Share Adding and Subtracting within 20
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15+4
19
17+3
20
12+6
18
13+5
18
10+9
19
10+10
20
10+6
16
10+5
15
12+7
19
12+8
20
14+6
20
14+5
19
14+3
17
14+4
18
18-4
14
17-6
11
