Subtract 21/6 from 10/21
1st number: 10/21, 2nd number: 3 3/6
1021 - 216 is -12742.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 6 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 21 × 2 = 42,
1021 = 10 × 221 × 2 = 2042 - Likewise, for the 2nd fraction, since 6 × 7 = 42,
216 = 21 × 76 × 7 = 14742 - Subtract the two like fractions:
2042 - 14742 = 20 - 14742 = -12742
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/21-21/6 10/21-42/6 10/42-21/6 10/21-21/12 30/21-21/6 10/21-63/6 10/63-21/6 10/21-21/18 50/21-21/6 10/21-21/30 70/21-21/6 10/21-21/42