Subtract 18/21 from 27/8
1st number: 3 3/8, 2nd number: 18/21
27/8 - 18/21 is 141/56.
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,
27/8 = 27 × 21/8 × 21 = 567/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
18/21 = 18 × 8/21 × 8 = 144/168 - Subtract the two like fractions:
567/168 - 144/168 = 567 - 144/168 = 423/168 - After reducing the fraction, the answer is 141/56
- In mixed form: 229/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/8-18/21 27/8-36/21 27/16-18/21 27/8-18/42 81/8-18/21 27/8-54/21 27/24-18/21 27/8-18/63 27/8-90/21 27/40-18/21 27/56-18/21