Subtract 1/6 from 15/21
15/21 - 1/6 is 23/42.
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,
15/21 = 15 × 2/21 × 2 = 30/42 - Likewise, for the 2nd fraction, since 6 × 7 = 42,
1/6 = 1 × 7/6 × 7 = 7/42 - Subtract the two like fractions:
30/42 - 7/42 = 30 - 7/42 = 23/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/21-1/6 15/21-2/6 15/42-1/6 15/21-1/12 45/21-1/6 15/21-3/6 15/63-1/6 15/21-1/18 75/21-1/6 15/21-5/6 15/21-1/30 15/21-7/6 15/21-1/42