Subtract 21/84 from 18/36
18/36 - 21/84 is 1/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 36 and 84 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 36 × 7 = 252,
18/36 = 18 × 7/36 × 7 = 126/252 - Likewise, for the 2nd fraction, since 84 × 3 = 252,
21/84 = 21 × 3/84 × 3 = 63/252 - Subtract the two like fractions:
126/252 - 63/252 = 126 - 63/252 = 63/252 - After reducing the fraction, the answer is 1/4
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