Originally Posted by Edwina's Secretary
When I was in school, they taught us that you label down 1-9 starting at 2, then label up 0-9,0 starting at 10. I know that's a horrid explanation so...
0x9 = . 0
1x9 = . 9
2x9 = 1 8
3x9 = 2 7
4x9 = 3 6
5x9 = 4 5
6x9 = 5 4
7x9 = 6 3
8x9 = 7 2
9x9 = 8 1
9x10= 9 0
Not as quick as the hand trick but it helps you memorize them!





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