Subtract 3/9 from 8/7
1st number: 1 1/7, 2nd number: 3/9
8/7 - 3/9 is 17/21.
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,
8/7 = 8 × 9/7 × 9 = 72/63 - Likewise, for the 2nd fraction, since 9 × 7 = 63,
3/9 = 3 × 7/9 × 7 = 21/63 - Subtract the two like fractions:
72/63 - 21/63 = 72 - 21/63 = 51/63 - After reducing the fraction, the answer is 17/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/7-3/9 8/7-6/9 8/14-3/9 8/7-3/18 24/7-3/9 8/21-3/9 8/7-3/27 40/7-3/9 8/7-15/9 8/35-3/9 8/7-3/45 56/7-3/9 8/7-21/9 8/49-3/9 8/7-3/63