Subtract 90/10 from 81/12
1st number: 6 9/12, 2nd number: 9 0/10
81/12 - 90/10 is -9/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 10 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 12 × 5 = 60,
81/12 = 81 × 5/12 × 5 = 405/60 - Likewise, for the 2nd fraction, since 10 × 6 = 60,
90/10 = 90 × 6/10 × 6 = 540/60 - Subtract the two like fractions:
405/60 - 540/60 = 405 - 540/60 = -135/60 - After reducing the fraction, the answer is -9/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/24-90/10 81/12-90/20 81/36-90/10 81/12-90/30 81/60-90/10 81/12-90/50 81/84-90/10 81/12-90/70