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you wrote 9 * 7 then proceeded to calculate 9 * 8. I find the 9s easy to remember. simply take the other number, reduce it by 1, then add the complementary th
by api_or_ipa 12y ago
you wrote 9 * 7 then proceeded to calculate 9 * 8. I find the 9s easy to remember. simply take the other number, reduce it by 1, then add the complementary that together sum to 9. for 9 * 7, this is 63,
- raverbashing 12y agoOuch, true Yeah, I know this trick for multiplying by 9, but I wanted it to be generic