Answers

2014-09-26T16:37:32+08:00
Clue Words for Addition:sum, total, in all ,perimeter,   Clue Words for Subtraction:difference,how much more ,exceed Clue Words for Multiplication
:product ,total ,area ,times ,Clue Words for Division 
:share ,distribute ,quotient ,average
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2014-09-26T18:45:27+08:00
By understanding the problem
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