Subtract 56/49 from 90/70, Solve 1 20/70

Subtract 56/49 from 90/70

1^st number: 1 20/70, 2^nd number: 1 7/49

90/70 - 56/49 is 1/7.

Find the least common denominator or LCM of the two denominators:
LCM of 70 and 49 is 490

Next, find the equivalent fraction of both fractional numbers with denominator 490
For the 1st fraction, since 70 × 7 = 490,
90/70 = 90 × 7/70 × 7 = 630/490
Likewise, for the 2nd fraction, since 49 × 10 = 490,
56/49 = 56 × 10/49 × 10 = 560/490
Subtract the two like fractions:
630/490 - 560/490 = 630 - 560/490 = 70/490
After reducing the fraction, the answer is 1/7

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