Subtract 84/63 from 3/90, Solve 3/90

Subtract 84/63 from 3/90

1^st number: 3/90, 2^nd number: 1 21/63

3/90 - 84/63 is -13/10.

Find the least common denominator or LCM of the two denominators:
LCM of 90 and 63 is 630

Next, find the equivalent fraction of both fractional numbers with denominator 630
For the 1st fraction, since 90 × 7 = 630,
3/90 = 3 × 7/90 × 7 = 21/630
Likewise, for the 2nd fraction, since 63 × 10 = 630,
84/63 = 84 × 10/63 × 10 = 840/630
Subtract the two like fractions:
21/630 - 840/630 = 21 - 840/630 = -819/630
After reducing the fraction, the answer is -13/10

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