7/8 divided by 2/3 = 15/16
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The reciprocal of a number is simply 1 divided by that number. In this case, the reciprocal of 2 and 3 over 7 would be 1 divided by 2 and 3 over 7. To find the reciprocal, you would flip the fraction, making it 7 over 2 and then take the reciprocal, which is 1 over 7/2 or 1 divided by 7/2. To divide by a fraction, you multiply by its reciprocal, so 1 divided by 7/2 is the same as 1 times 2/7, which simplifies to 2/7.
7/2 = 7 divided by 2 = 3 1/2
3/7 divided by 9
(20/21)/(2/3) = (20/21) x (3/2) = 10/7 = 1 and 3/7 = 1.428571429
(3/8) / (7/12) = 3/8 * 12/7 = (3*12)/(8*7) = (3*3)/(2/7) = 9/14