Subtract 21/7 from 8/10
1st number: 8/10, 2nd number: 3 0/7
8/10 - 21/7 is -11/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 7 is 70
Next, find the equivalent fraction of both fractional numbers with denominator 70 - For the 1st fraction, since 10 × 7 = 70,
8/10 = 8 × 7/10 × 7 = 56/70 - Likewise, for the 2nd fraction, since 7 × 10 = 70,
21/7 = 21 × 10/7 × 10 = 210/70 - Subtract the two like fractions:
56/70 - 210/70 = 56 - 210/70 = -154/70 - After reducing the fraction, the answer is -11/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/10-21/7 8/10-42/7 8/20-21/7 8/10-21/14 24/10-21/7 8/10-63/7 8/30-21/7 40/10-21/7 8/50-21/7 8/10-21/35 56/10-21/7 8/70-21/7 8/10-21/49