Subtract 27/21 from 20/8
1st number: 2 4/8, 2nd number: 1 6/21
20/8 - 27/21 is 17/14.
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,
20/8 = 20 × 21/8 × 21 = 420/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
27/21 = 27 × 8/21 × 8 = 216/168 - Subtract the two like fractions:
420/168 - 216/168 = 420 - 216/168 = 204/168 - After reducing the fraction, the answer is 17/14
- In mixed form: 13/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/8-27/21 20/8-54/21 20/16-27/21 20/8-27/42 60/8-27/21 20/8-81/21 20/24-27/21 20/8-27/63 20/40-27/21 20/56-27/21