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Originally Posted by HungLikeJesus
I find the squares interesting - that the square of a number ending in 1 or 9 always ends in 1, 2 or 8 in 4, 3 or 7 in 9, 4 or 6 in 6, 0 in 0 and 5 in 5.
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See, to me this kind of stuff was always so frustrating and completely useless. What good does it do?
"What's 9 squared?"
"Er, I don't know--but I know it ends in a 1!"
I had several teachers try to teach us cute little tricks like this, and it always seemed to me that memorizing the tricks was much harder than just memorizing the answer in the first place. But I'm down with monster's method of memorizing the answers organically as part of general learning, rather than drilling them.