Quote:
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Originally Posted by captobvious
803
If you're curious what the trick is, it's pretty simple. You take the two digit number, add the digits together, and stick it in between. In this case...
11*73=?
7+3 = 10 so you carry the 1 and get 803
Here's an example without carrying
11*23 = 253
Now everyone can do it!
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Is that really any faster than adding a 0 (multiplying by 10), and adding the two digit number?
11*73=?
730 + 73 = 803
or
11*23=?
230 + 23 = 253
Don't look at me. I'm mathematically illiterate. That's just the way that I was taught.
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