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2015-07-04T14:37:43+08:00
It depends on the problem..

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2015-07-04T14:47:34+08:00

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It depends on the problem. But it is better if the student knows/memorizes the basics like multiplication table and knows how to compute mentally.
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so , I`ll memorize all the formulas , thank you :)
Hope that helps. ^^
thanks again :D
You're welcome