Math is FUN
If you're having trouble remembering your 9x Table, this is the trick for you. Where was this when I was in elementary school?
Hold your hands in front of you with your fingers spread out. From left to right, number each finger up to ten.
For 9 X 3 bend your third finger down. (9 X 4 would be the fourth finger etc.)
You have 2 fingers in front of the bent finger and 7 after the bent finger
Thus the answer must be 27
This technique works for the 9 times tables up to 10.
What about the 11x Table? starts out easy enough but when the multiplier gets too big, things get tricky. Try this!
Multiply 11 by 18 (or any two-digit number). Jot down 1 and 8 with a space between it. 1 -- 8.
Add the 8 and the 1 and put that number in the middle: 198
And finally, see if you can figure out the "Magic Gopher"
posted by Unknown @ 11:50 AM
1 comments
1 Comments:
I can't figure out the math behind that magic British Council shill, but does it have something to do with "subtract the number of tens + the number of ones from the original number"? Cuz that's what you're doing.
Here's my math tip: never divide by zero or your calculator will say "ERROR". And zero times any number except 1/0 is zero. For the 1/0 case, see my original advice.
Also, there is something called reverse polish notation.
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