To divide by a fraction, multiply by its reciprocal. In this instance, 16/21 / 8/9 is equal to 16/21 x 9/8 = 0.857142 recurring (that is, 0.857142857142...)
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0.381
7/8 divided by 2/3 = 15/16
21/24 = 7/8 So the question can be reworded as 7/8 divided by 7/8 and since any non-zero number divided by itself is 1, the answer is 1.
16 / 8 + 2 * 5 - 21 / 7 = 2 + 10 - 3 (multiplication and division first) = 9
16/5 divided by 4/25 is 20.