Subtract 50/7 from 9/90, Solve 9/90

Subtract 50/7 from 9/90

1^st number: 9/90, 2^nd number: 7 1/7

9/90 - 50/7 is -493/70.

Find the least common denominator or LCM of the two denominators:
LCM of 90 and 7 is 630

Next, find the equivalent fraction of both fractional numbers with denominator 630
For the 1st fraction, since 90 × 7 = 630,
9/90 = 9 × 7/90 × 7 = 63/630
Likewise, for the 2nd fraction, since 7 × 90 = 630,
50/7 = 50 × 90/7 × 90 = 4500/630
Subtract the two like fractions:
63/630 - 4500/630 = 63 - 4500/630 = -4437/630
After reducing the fraction, the answer is -493/70

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