Subtract 14/50 from 21/90, Solve 21/90

Subtract 14/50 from 21/90

21/90 - 14/50 is -7/150.

Find the least common denominator or LCM of the two denominators:
LCM of 90 and 50 is 450

Next, find the equivalent fraction of both fractional numbers with denominator 450
For the 1st fraction, since 90 × 5 = 450,
21/90 = 21 × 5/90 × 5 = 105/450
Likewise, for the 2nd fraction, since 50 × 9 = 450,
14/50 = 14 × 9/50 × 9 = 126/450
Subtract the two like fractions:
105/450 - 126/450 = 105 - 126/450 = -21/450
After reducing the fraction, the answer is -7/150

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