Subtract 5/21 from 2/8
2/8 - 5/21 is 1/84.
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,
2/8 = 2 × 21/8 × 21 = 42/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
5/21 = 5 × 8/21 × 8 = 40/168 - Subtract the two like fractions:
42/168 - 40/168 = 42 - 40/168 = 2/168 - After reducing the fraction, the answer is 1/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/8-5/21 2/8-10/21 2/16-5/21 2/8-5/42 6/8-5/21 2/8-15/21 2/24-5/21 2/8-5/63 10/8-5/21 2/8-25/21 2/40-5/21 14/8-5/21 2/8-35/21 2/56-5/21