Subtract 3/90 from 56/21, Solve 2 14/21

Subtract 3/90 from 56/21

1^st number: 2 14/21, 2^nd number: 3/90

56/21 - 3/90 is 79/30.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 90 is 630

Next, find the equivalent fraction of both fractional numbers with denominator 630
For the 1st fraction, since 21 × 30 = 630,
56/21 = 56 × 30/21 × 30 = 1680/630
Likewise, for the 2nd fraction, since 90 × 7 = 630,
3/90 = 3 × 7/90 × 7 = 21/630
Subtract the two like fractions:
1680/630 - 21/630 = 1680 - 21/630 = 1659/630
After reducing the fraction, the answer is 79/30
In mixed form: 219/30

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