Subtract 90/7 from 72/12
1st number: 6 0/12, 2nd number: 12 6/7
72/12 - 90/7 is -48/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 7 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
72/12 = 72 × 7/12 × 7 = 504/84 - Likewise, for the 2nd fraction, since 7 × 12 = 84,
90/7 = 90 × 12/7 × 12 = 1080/84 - Subtract the two like fractions:
504/84 - 1080/84 = 504 - 1080/84 = -576/84 - After reducing the fraction, the answer is -48/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/24-90/7 72/12-90/14 72/36-90/7 72/12-90/21 72/60-90/7 72/12-90/35 72/84-90/7 72/12-90/49