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i am weak in mathematics so what is the best way to calculate in mind that a thing which is of 63 and i have 100 so how much will be left?

If you're asking how to calculate in your head 100 - 63, the easiest way is to realize that the digits on the right need to add to 10 and the ones on the left add to 9. 3+7=10 and 6+3=9 so the answer is 37. That works for 100, but really, it just take practice.

I can answer questions in basic algebra and any grade school math.

Love math, currently helping my nephew get through Intermediate Algebra.**Education/Credentials**

I majored in Math Ed in college (but decided not to teach), so have over 40 credits of math.