Subtract 21/54 from 7/5
1st number: 1 2/5, 2nd number: 21/54
7/5 - 21/54 is 91/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 54 is 270
Next, find the equivalent fraction of both fractional numbers with denominator 270 - For the 1st fraction, since 5 × 54 = 270,
7/5 = 7 × 54/5 × 54 = 378/270 - Likewise, for the 2nd fraction, since 54 × 5 = 270,
21/54 = 21 × 5/54 × 5 = 105/270 - Subtract the two like fractions:
378/270 - 105/270 = 378 - 105/270 = 273/270 - After reducing the fraction, the answer is 91/90
- In mixed form: 11/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/5-21/54 7/5-42/54 7/10-21/54 21/5-21/54 7/5-63/54 7/15-21/54 35/5-21/54 7/25-21/54 49/5-21/54 7/35-21/54