Use the trigonometric function.

3/4 of children mar buying lunch because if u divide 27 by 9 you get three, which is the numerator. Then you divide 36 by 9 to get 4, which is the demoninator. making the simplied version 3/4
5 * 3 does not tell you the total number of flash cards in 5 piles because you don't know how many cards are in each pile.
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