Subtract 6/21 from 3/8
3/8 - 6/21 is 5/56.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 21 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 8 × 21 = 168,
3/8 = 3 × 21/8 × 21 = 63/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
6/21 = 6 × 8/21 × 8 = 48/168 - Subtract the two like fractions:
63/168 - 48/168 = 63 - 48/168 = 15/168 - After reducing the fraction, the answer is 5/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/8-6/21 3/8-12/21 3/16-6/21 3/8-6/42 9/8-6/21 3/8-18/21 3/24-6/21 3/8-6/63 15/8-6/21 3/8-30/21 3/40-6/21 21/8-6/21 3/8-42/21 3/56-6/21