Subtract 7/5 from 21/45
1st number: 21/45, 2nd number: 1 2/5
21/45 - 7/5 is -14/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 5 is 45
Next, find the equivalent fraction of both fractional numbers with denominator 45 - For the 1st fraction, since 45 × 1 = 45,
21/45 = 21 × 1/45 × 1 = 21/45 - Likewise, for the 2nd fraction, since 5 × 9 = 45,
7/5 = 7 × 9/5 × 9 = 63/45 - Subtract the two like fractions:
21/45 - 63/45 = 21 - 63/45 = -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: 42/45-7/5 21/45-14/5 21/90-7/5 21/45-7/10 63/45-7/5 21/45-21/5 21/45-7/15 21/45-35/5 21/45-7/25 21/45-49/5 21/45-7/35