Subtract 81/7 from 90/25
1st number: 3 15/25, 2nd number: 11 4/7
90/25 - 81/7 is -279/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 25 and 7 is 175
Next, find the equivalent fraction of both fractional numbers with denominator 175 - For the 1st fraction, since 25 × 7 = 175,
90/25 = 90 × 7/25 × 7 = 630/175 - Likewise, for the 2nd fraction, since 7 × 25 = 175,
81/7 = 81 × 25/7 × 25 = 2025/175 - Subtract the two like fractions:
630/175 - 2025/175 = 630 - 2025/175 = -1395/175 - After reducing the fraction, the answer is -279/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/50-81/7 90/25-81/14 90/75-81/7 90/25-81/21 90/25-81/35 90/25-81/49