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Math Subtraction Review

Theses basic facts should be well-known! Test your quick reflexes!
AB
12 - 7 =5
13 - 9 =4
10 - 7 =3
11 - 9 =2
18 - 12 =6
15 - 8 =7
12- 4 =8
14 - 5 =9
20 - 9 =11
17 - 7 =10
19 - 18 =1
17 - 5 =12
15 - 2 =13
19 - 5 =14
21 - 6 =15
18 - 2 =16
20 - 3 =17
20 - 2 =18
13 - 13 =0
22 - 3 =19

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