Subtract 21/9 from 7/5
1st number: 1 2/5, 2nd number: 2 3/9
7/5 - 21/9 is -14/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 9 is 45
Next, find the equivalent fraction of both fractional numbers with denominator 45 - For the 1st fraction, since 5 × 9 = 45,
7/5 = 7 × 9/5 × 9 = 63/45 - Likewise, for the 2nd fraction, since 9 × 5 = 45,
21/9 = 21 × 5/9 × 5 = 105/45 - Subtract the two like fractions:
63/45 - 105/45 = 63 - 105/45 = -42/45 - After reducing the fraction, the answer is -14/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/5-21/9 7/5-42/9 7/10-21/9 7/5-21/18 21/5-21/9 7/5-63/9 7/15-21/9 7/5-21/27 35/5-21/9 7/25-21/9 7/5-21/45 49/5-21/9 7/35-21/9 7/5-21/63