Subtract 4/7 from 3/9
3/9 - 4/7 is -5/21.
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,
4/7 = 4 × 9/7 × 9 = 36/63 - Subtract the two like fractions:
21/63 - 36/63 = 21 - 36/63 = -15/63 - After reducing the fraction, the answer is -5/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/9-4/7 3/9-8/7 3/18-4/7 3/9-4/14 3/9-12/7 3/27-4/7 3/9-4/21 15/9-4/7 3/9-20/7 3/45-4/7 3/9-4/35 21/9-4/7 3/9-28/7 3/63-4/7 3/9-4/49