15 21 ---- ÷ ---- 16 4 PLEASE REDUCE/SIMPLIFY
= (15/16)*(4/21)
= (5/4)*(1/7)
= 5/28
15 / 16 ÷ 21 / 4 invert the second fraction and multiply
15 / 16 * 4 / 21
Note that we can swap denominators
15 / 21 * 4 /16 reduce both fractions
5 / 7 * 1 / 4
5 / 28
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