Subtract 49/36 from 81/80
1st number: 1 1/80, 2nd number: 1 13/36
81/80 - 49/36 is -251/720.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 36 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 80 × 9 = 720,
81/80 = 81 × 9/80 × 9 = 729/720 - Likewise, for the 2nd fraction, since 36 × 20 = 720,
49/36 = 49 × 20/36 × 20 = 980/720 - Subtract the two like fractions:
729/720 - 980/720 = 729 - 980/720 = -251/720
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/80-98/36 81/80-49/72