Updated August 17, 2004
Created August 17, 2004


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9 * 1 =  9
9 * 2 = 18
9 * 3 = 27
9 * 4 = 36
9 * 5 = 45
9 * 6 = 54
9 * 7 = 63
9 * 8 = 72
9 * 9 = 81
9 * 10 = 90
one less than the number, the 2 numbers must add up to equal 9

5 5 5 5 5 5 5 5 5 5
+ + + + + + + + + +
0 1 2 3 4 5 6 7 8 9
5 6 7 8 9 10 11 12 13 14

doubles that don't affect the 10's digit - left column
doubles that do affect the 10's digit - right column

0 + 0 = 05 + 5 = 10
1 + 1 = 26 + 6 = 12
2 + 2 = 47 + 7 = 14
3 + 3 = 68 + 8 = 16
4 + 4 = 89 + 9 = 18

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