Subtract 7/54 from 21/7
1st number: 3 0/7, 2nd number: 7/54
21/7 - 7/54 is 155/54.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 54 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 7 × 54 = 378,
21/7 = 21 × 54/7 × 54 = 1134/378 - Likewise, for the 2nd fraction, since 54 × 7 = 378,
7/54 = 7 × 7/54 × 7 = 49/378 - Subtract the two like fractions:
1134/378 - 49/378 = 1134 - 49/378 = 1085/378 - After reducing the fraction, the answer is 155/54
- In mixed form: 247/54
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/7-7/54 21/7-14/54 21/14-7/54 63/7-7/54 21/7-21/54 21/7-35/54 21/35-7/54 21/7-49/54 21/49-7/54