Subtract 28/42 from 9/20
9/20 - 28/42 is -13/60.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 42 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 20 × 21 = 420,
9/20 = 9 × 21/20 × 21 = 189/420 - Likewise, for the 2nd fraction, since 42 × 10 = 420,
28/42 = 28 × 10/42 × 10 = 280/420 - Subtract the two like fractions:
189/420 - 280/420 = 189 - 280/420 = -91/420 - After reducing the fraction, the answer is -13/60
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