Subtract 9/60 from 15/21, Solve 15/21

Subtract 9/60 from 15/21

15/21 - 9/60 is 79/140.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 60 is 420

Next, find the equivalent fraction of both fractional numbers with denominator 420
For the 1st fraction, since 21 × 20 = 420,
15/21 = 15 × 20/21 × 20 = 300/420
Likewise, for the 2nd fraction, since 60 × 7 = 420,
9/60 = 9 × 7/60 × 7 = 63/420
Subtract the two like fractions:
300/420 - 63/420 = 300 - 63/420 = 237/420
After reducing the fraction, the answer is 79/140

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