Subtract 72/70 from 15/60, Solve 15/60

Subtract 72/70 from 15/60

1^st number: 15/60, 2^nd number: 1 2/70

15/60 - 72/70 is -109/140.

Find the least common denominator or LCM of the two denominators:
LCM of 60 and 70 is 420

Next, find the equivalent fraction of both fractional numbers with denominator 420
For the 1st fraction, since 60 × 7 = 420,
15/60 = 15 × 7/60 × 7 = 105/420
Likewise, for the 2nd fraction, since 70 × 6 = 420,
72/70 = 72 × 6/70 × 6 = 432/420
Subtract the two like fractions:
105/420 - 432/420 = 105 - 432/420 = -327/420
After reducing the fraction, the answer is -109/140

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