Subtract 10/6 from 90/70, Solve 1 20/70

Subtract 10/6 from 90/70

1^st number: 1 20/70, 2^nd number: 1 4/6

90/70 - 10/6 is -8/21.

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,
90/70 = 90 × 3/70 × 3 = 270/210
Likewise, for the 2nd fraction, since 6 × 35 = 210,
10/6 = 10 × 35/6 × 35 = 350/210
Subtract the two like fractions:
270/210 - 350/210 = 270 - 350/210 = -80/210
After reducing the fraction, the answer is -8/21

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