Subtract 81/72 from 90/50
1st number: 1 40/50, 2nd number: 1 9/72
90/50 - 81/72 is 27/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 50 and 72 is 1800
Next, find the equivalent fraction of both fractional numbers with denominator 1800 - For the 1st fraction, since 50 × 36 = 1800,
90/50 = 90 × 36/50 × 36 = 3240/1800 - Likewise, for the 2nd fraction, since 72 × 25 = 1800,
81/72 = 81 × 25/72 × 25 = 2025/1800 - Subtract the two like fractions:
3240/1800 - 2025/1800 = 3240 - 2025/1800 = 1215/1800 - After reducing the fraction, the answer is 27/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: