Subtract 6/21 from 15/42
15/42 - 6/21 is 1/14.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 21 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 42 × 1 = 42,
15/42 = 15 × 1/42 × 1 = 15/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
6/21 = 6 × 2/21 × 2 = 12/42 - Subtract the two like fractions:
15/42 - 12/42 = 15 - 12/42 = 3/42 - After reducing the fraction, the answer is 1/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/42-6/21 15/42-12/21 15/84-6/21 15/42-6/42 45/42-6/21 15/42-18/21 15/42-6/63 75/42-6/21 15/42-30/21 15/42-42/21