Subtract 18/54 from 21/49
21/49 - 18/54 is 2/21.
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,
18/54 = 18 × 49/54 × 49 = 882/2646 - Subtract the two like fractions:
1134/2646 - 882/2646 = 1134 - 882/2646 = 252/2646 - After reducing the fraction, the answer is 2/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/49-18/54 21/49-36/54 21/98-18/54 63/49-18/54 21/49-90/54