Subtract 7/45 from 54/21
1st number: 2 12/21, 2nd number: 7/45
54/21 - 7/45 is 761/315.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 45 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 21 × 15 = 315,
54/21 = 54 × 15/21 × 15 = 810/315 - Likewise, for the 2nd fraction, since 45 × 7 = 315,
7/45 = 7 × 7/45 × 7 = 49/315 - Subtract the two like fractions:
810/315 - 49/315 = 810 - 49/315 = 761/315 - In mixed form: 2131/315
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/21-14/45 54/42-7/45 54/21-7/90 54/21-21/45 54/63-7/45 54/21-35/45 54/21-49/45