Subtract 2/7 from 3/9
3/9 - 2/7 is 1/21.
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,
2/7 = 2 × 9/7 × 9 = 18/63 - Subtract the two like fractions:
21/63 - 18/63 = 21 - 18/63 = 3/63 - After reducing the fraction, the answer is 1/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/9-2/7 3/9-4/7 3/18-2/7 3/9-2/14 3/9-6/7 3/27-2/7 3/9-2/21 15/9-2/7 3/9-10/7 3/45-2/7 3/9-2/35 21/9-2/7 3/9-14/7 3/63-2/7 3/9-2/49