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Build up subtraction facts

Build up through the 10 frame subtraction facts (Problems with 8 or 9 as the known part)

AB
16-9=7
15-9=6
14-9=5
13-9=4
12-9=3
11-9=2
14-8=6
13-8=5
12-8=4
11-8=3
10-8=2

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