Subtract 3/7 from 3/9
3/9 - 3/7 is -2/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 7 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 9 × 7 = 63,
3/9 = 3 × 7/9 × 7 = 21/63 - Likewise, for the 2nd fraction, since 7 × 9 = 63,
3/7 = 3 × 9/7 × 9 = 27/63 - Subtract the two like fractions:
21/63 - 27/63 = 21 - 27/63 = -6/63 - After reducing the fraction, the answer is -2/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/9-3/7 3/9-6/7 3/18-3/7 3/9-3/14 3/9-9/7 3/27-3/7 3/9-3/21 15/9-3/7 3/9-15/7 3/45-3/7 3/9-3/35 21/9-3/7 3/9-21/7 3/63-3/7 3/9-3/49