Subtract 81/80 from 90/36
1st number: 2 18/36, 2nd number: 1 1/80
90/36 - 81/80 is 119/80.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 36 and 80 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 36 × 20 = 720,
90/36 = 90 × 20/36 × 20 = 1800/720 - Likewise, for the 2nd fraction, since 80 × 9 = 720,
81/80 = 81 × 9/80 × 9 = 729/720 - Subtract the two like fractions:
1800/720 - 729/720 = 1800 - 729/720 = 1071/720 - After reducing the fraction, the answer is 119/80
- In mixed form: 139/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/72-81/80