Subtraction Table

Subtraction Table
You can "look up" answers for simple subtraction using this table:
0 1 2 3 4 5 6 7 8 9 10 11 12
0 0
1 1 0
2 2 1 0
3 3 2 1 0
4 4 3 2 1 0
5 5 4 3 2 1 0
6 6 5 4 3 2 1 0
7 7 6 5 4 3 2 1 0
8 8 7 6 5 4 3 2 1 0
9 9 8 7 6 5 4 3 2 1 0
10 10 9 8 7 6 5 4 3 2 1 0
11 11 10 9 8 7 6 5 4 3 2 1 0
12 12 11 10 9 8 7 6 5 4 3 2 1 0
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