Subtract 28/21 from 3/10
1st number: 3/10, 2nd number: 1 7/21
3/10 - 28/21 is -31/30.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 21 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 10 × 21 = 210,
3/10 = 3 × 21/10 × 21 = 63/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
28/21 = 28 × 10/21 × 10 = 280/210 - Subtract the two like fractions:
63/210 - 280/210 = 63 - 280/210 = -217/210 - After reducing the fraction, the answer is -31/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/10-28/21 3/10-56/21 3/20-28/21 3/10-28/42 9/10-28/21 3/10-84/21 3/30-28/21 3/10-28/63 15/10-28/21 3/50-28/21 21/10-28/21 3/70-28/21