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subtraction facts

Subtract basic facts with differences of 9 through 0.
AB
18-99
17-98
17-89
16-97
16-88
16-79
15-96
15-87
15-78
15-69
14-95
14-86
14-77
14-68
14-59
13-94
13-85
13-76
13-67
13-58
13-49
12-93
12-84
12-75
12-66
12-57
12-48
12-39
11-92
11-83
11-74
11-65
11-56
11-47
11-38
11-29

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