Subtract 1/21 from 18/36
18/36 - 1/21 is 19/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 36 and 21 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 21 × 12 = 252,
1/21 = 1 × 12/21 × 12 = 12/252 - Subtract the two like fractions:
126/252 - 12/252 = 126 - 12/252 = 114/252 - After reducing the fraction, the answer is 19/42
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