Subtract 90/9 from 81/24
1st number: 3 9/24, 2nd number: 10 0/9
81/24 - 90/9 is -53/8.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 24 and 9 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 24 × 3 = 72,
81/24 = 81 × 3/24 × 3 = 243/72 - Likewise, for the 2nd fraction, since 9 × 8 = 72,
90/9 = 90 × 8/9 × 8 = 720/72 - Subtract the two like fractions:
243/72 - 720/72 = 243 - 720/72 = -477/72 - After reducing the fraction, the answer is -53/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/48-90/9 81/24-90/18 81/72-90/9 81/24-90/27 81/24-90/45 81/24-90/63