Subtract 1/8 from 3/21
3/21 - 1/8 is 1/56.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 8 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 21 × 8 = 168,
3/21 = 3 × 8/21 × 8 = 24/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
1/8 = 1 × 21/8 × 21 = 21/168 - Subtract the two like fractions:
24/168 - 21/168 = 24 - 21/168 = 3/168 - After reducing the fraction, the answer is 1/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/21-1/8 3/21-2/8 3/42-1/8 3/21-1/16 9/21-1/8 3/21-3/8 3/63-1/8 3/21-1/24 15/21-1/8 3/21-5/8 3/21-1/40 3/21-7/8 3/21-1/56