Subtract 28/9 from 90/7
1st number: 12 6/7, 2nd number: 3 1/9
90/7 - 28/9 is 614/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 9 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 7 × 9 = 63,
90/7 = 90 × 9/7 × 9 = 810/63 - Likewise, for the 2nd fraction, since 9 × 7 = 63,
28/9 = 28 × 7/9 × 7 = 196/63 - Subtract the two like fractions:
810/63 - 196/63 = 810 - 196/63 = 614/63 - In mixed form: 947/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/7-56/9 90/14-28/9 90/7-28/18 90/7-84/9 90/21-28/9 90/7-28/27 90/35-28/9 90/7-28/45 90/49-28/9 90/7-28/63