Subtract 90/6 from 72/70, Solve 1 2/70

Subtract 90/6 from 72/70

1^st number: 1 2/70, 2^nd number: 15 0/6

72/70 - 90/6 is -489/35.

Find the least common denominator or LCM of the two denominators:
LCM of 70 and 6 is 210

Next, find the equivalent fraction of both fractional numbers with denominator 210
For the 1st fraction, since 70 × 3 = 210,
72/70 = 72 × 3/70 × 3 = 216/210
Likewise, for the 2nd fraction, since 6 × 35 = 210,
90/6 = 90 × 35/6 × 35 = 3150/210
Subtract the two like fractions:
216/210 - 3150/210 = 216 - 3150/210 = -2934/210
After reducing the fraction, the answer is -489/35

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