Subtract 9/54 from 21/7
1st number: 3 0/7, 2nd number: 9/54
21/7 - 9/54 is 17/6.
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,
9/54 = 9 × 7/54 × 7 = 63/378 - Subtract the two like fractions:
1134/378 - 63/378 = 1134 - 63/378 = 1071/378 - After reducing the fraction, the answer is 17/6
- In mixed form: 25/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/7-9/54 21/7-18/54 21/14-9/54 63/7-9/54 21/7-27/54 21/7-45/54 21/35-9/54 21/7-63/54 21/49-9/54