Subtract 15/21 from 5/6
5/6 - 15/21 is 5/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 6 and 21 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 6 × 7 = 42,
5/6 = 5 × 7/6 × 7 = 35/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
15/21 = 15 × 2/21 × 2 = 30/42 - Subtract the two like fractions:
35/42 - 30/42 = 35 - 30/42 = 5/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/6-15/21 5/6-30/21 5/12-15/21 5/6-15/42 15/6-15/21 5/6-45/21 5/18-15/21 5/6-15/63 25/6-15/21 5/6-75/21 5/30-15/21 35/6-15/21 5/42-15/21