Subtract 54/80 from 30/72
30/72 - 54/80 is -31/120.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 80 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 72 × 10 = 720,
30/72 = 30 × 10/72 × 10 = 300/720 - Likewise, for the 2nd fraction, since 80 × 9 = 720,
54/80 = 54 × 9/80 × 9 = 486/720 - Subtract the two like fractions:
300/720 - 486/720 = 300 - 486/720 = -186/720 - After reducing the fraction, the answer is -31/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/72-54/80 90/72-54/80