Subtract 4/54 from 21/42
21/42 - 4/54 is 23/54.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 54 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 42 × 9 = 378,
21/42 = 21 × 9/42 × 9 = 189/378 - Likewise, for the 2nd fraction, since 54 × 7 = 378,
4/54 = 4 × 7/54 × 7 = 28/378 - Subtract the two like fractions:
189/378 - 28/378 = 189 - 28/378 = 161/378 - After reducing the fraction, the answer is 23/54
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