Teaching kids real math with computers/calculators

[Albert Chan]

I think teaching math with calculator or a computer is a mistake.
Students need to be able to do it in their head.

Only *after* that step is solid, should calculator is used (to save time)

One time I was in a supermarket, the cash machine was broken.
The cashier math skill were so bad, the change I get back is *more* than I paid her !