Answers

2014-10-01T20:16:15+08:00
2014-10-01T20:21:58+08:00
Memorize multiplication table. XD  specially 2x2, 3x3 and so on (those multipled by thier own). :3 ex: squareroot of 4 is 2 because 2x2 is equals to 4. ex: square root of 81 is 9, because 9x9 is equal to 81.
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