Subtract 2/9 from 21/7
1st number: 3 0/7, 2nd number: 2/9
21/7 - 2/9 is 25/9.
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,
21/7 = 21 × 9/7 × 9 = 189/63 - Likewise, for the 2nd fraction, since 9 × 7 = 63,
2/9 = 2 × 7/9 × 7 = 14/63 - Subtract the two like fractions:
189/63 - 14/63 = 189 - 14/63 = 175/63 - After reducing the fraction, the answer is 25/9
- In mixed form: 27/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/7-2/9 21/7-4/9 21/14-2/9 21/7-2/18 63/7-2/9 21/7-6/9 21/7-2/27 21/7-10/9 21/35-2/9 21/7-2/45 21/7-14/9 21/49-2/9 21/7-2/63