Subtract 18/21 from 20/60
20/60 - 18/21 is -11/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 60 and 21 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 60 × 7 = 420,
20/60 = 20 × 7/60 × 7 = 140/420 - Likewise, for the 2nd fraction, since 21 × 20 = 420,
18/21 = 18 × 20/21 × 20 = 360/420 - Subtract the two like fractions:
140/420 - 360/420 = 140 - 360/420 = -220/420 - After reducing the fraction, the answer is -11/21
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