Subtract 6/54 from 20/21
20/21 - 6/54 is 53/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 54 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 21 × 18 = 378,
20/21 = 20 × 18/21 × 18 = 360/378 - Likewise, for the 2nd fraction, since 54 × 7 = 378,
6/54 = 6 × 7/54 × 7 = 42/378 - Subtract the two like fractions:
360/378 - 42/378 = 360 - 42/378 = 318/378 - After reducing the fraction, the answer is 53/63
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