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>> For future reference, 8 x 9 = 72. It should not take 3.04s to solve that next time. I really disliked learning the multiplication tables. When faced with 8
by 3825 13y ago
>> For future reference, 8 x 9 = 72. It should not take 3.04s to solve that next time.
I really disliked learning the multiplication tables. When faced with 8 * 9, my mind thinks 8 * 8 = 64 and adds 8 to it to get 72. :-/
- mrkickling 13y agoI use to think of it like 10 and then subtract with the other factor. For example if you have 9x7, think 10x7 and then subtract 7. 70-7 = 63. And if you have 9x9 just think 90-9=81. 9x10 = 100-10 = 90 9x15 = 150-15 = 135 and so on..
- mkmk 13y agoMultiplying by 9 is easy using your fingers (assuming you don't want to multiply by more than 10). http://www.youtube.com/watch?v=CVbcra3rCqc http://www.youtube.com/watch?v=CVbcra3rCqc