Subtract 50/21 from 27/18, Solve 1 9/18

Subtract 50/21 from 27/18

1^st number: 1 9/18, 2^nd number: 2 8/21

27/18 - 50/21 is -37/42.

Find the least common denominator or LCM of the two denominators:
LCM of 18 and 21 is 126

Next, find the equivalent fraction of both fractional numbers with denominator 126
For the 1st fraction, since 18 × 7 = 126,
27/18 = 27 × 7/18 × 7 = 189/126
Likewise, for the 2nd fraction, since 21 × 6 = 126,
50/21 = 50 × 6/21 × 6 = 300/126
Subtract the two like fractions:
189/126 - 300/126 = 189 - 300/126 = -111/126
After reducing the fraction, the answer is -37/42

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