Subtract 75/21 from 35/54
1st number: 35/54, 2nd number: 3 12/21
35/54 - 75/21 is -1105/378.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 54 and 21 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 54 × 7 = 378,
35/54 = 35 × 7/54 × 7 = 245/378 - Likewise, for the 2nd fraction, since 21 × 18 = 378,
75/21 = 75 × 18/21 × 18 = 1350/378 - Subtract the two like fractions:
245/378 - 1350/378 = 245 - 1350/378 = -1105/378
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/54-75/21 35/54-75/42 35/54-75/63