Subtract 21/7 from 10/5
1st number: 2 0/5, 2nd number: 3 0/7
10/5 - 21/7 is -1/1.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 7 is 35
Next, find the equivalent fraction of both fractional numbers with denominator 35 - For the 1st fraction, since 5 × 7 = 35,
10/5 = 10 × 7/5 × 7 = 70/35 - Likewise, for the 2nd fraction, since 7 × 5 = 35,
21/7 = 21 × 5/7 × 5 = 105/35 - Subtract the two like fractions:
70/35 - 105/35 = 70 - 105/35 = -35/35 - After reducing the fraction, the answer is -1/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/5-21/7 10/5-42/7 10/5-21/14 30/5-21/7 10/5-63/7 10/15-21/7 50/5-21/7 10/25-21/7 10/5-21/35 70/5-21/7 10/35-21/7 10/5-21/49