23 - 0 = 23
Minus Zero Facts
8 + 8 =?
16
7 + 7 = 14
Doubles Facts
54 + 10 = X
64
87 - 87 = 0
Take all facts
122 + 200 = T
18 - 3 = 15
Count Back Facts
345 - 20 = D
325
7 + 3 = 10
Make 10 Fact
231 - 120 = D
111
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