Subtract 20/54 from 21/49
21/49 - 20/54 is 11/189.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 49 and 54 is 2646
Next, find the equivalent fraction of both fractional numbers with denominator 2646 - For the 1st fraction, since 49 × 54 = 2646,
21/49 = 21 × 54/49 × 54 = 1134/2646 - Likewise, for the 2nd fraction, since 54 × 49 = 2646,
20/54 = 20 × 49/54 × 49 = 980/2646 - Subtract the two like fractions:
1134/2646 - 980/2646 = 1134 - 980/2646 = 154/2646 - After reducing the fraction, the answer is 11/189
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/49-20/54 21/49-40/54 21/98-20/54 63/49-20/54 21/49-60/54