Subtract 90/60 from 50/21, Solve 2 8/21

Subtract 90/60 from 50/21

1^st number: 2 8/21, 2^nd number: 1 30/60

50/21 - 90/60 is 37/42.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 60 is 420

Next, find the equivalent fraction of both fractional numbers with denominator 420
For the 1st fraction, since 21 × 20 = 420,
50/21 = 50 × 20/21 × 20 = 1000/420
Likewise, for the 2nd fraction, since 60 × 7 = 420,
90/60 = 90 × 7/60 × 7 = 630/420
Subtract the two like fractions:
1000/420 - 630/420 = 1000 - 630/420 = 370/420
After reducing the fraction, the answer is 37/42

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