Subtract 5/20 from 12/84
12/84 - 5/20 is -3/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 84 × 5 = 420,
12/84 = 12 × 5/84 × 5 = 60/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
5/20 = 5 × 21/20 × 21 = 105/420 - Subtract the two like fractions:
60/420 - 105/420 = 60 - 105/420 = -45/420 - After reducing the fraction, the answer is -3/28
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