Subtract 27/8 from 7/21
1st number: 7/21, 2nd number: 3 3/8
7/21 - 27/8 is -73/24.
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,
7/21 = 7 × 8/21 × 8 = 56/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
27/8 = 27 × 21/8 × 21 = 567/168 - Subtract the two like fractions:
56/168 - 567/168 = 56 - 567/168 = -511/168 - After reducing the fraction, the answer is -73/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/21-27/8 7/21-54/8 7/42-27/8 7/21-27/16 7/21-81/8 7/63-27/8 7/21-27/24 35/21-27/8 7/21-27/40 49/21-27/8 7/21-27/56