Subtract 27/21 from 5/20
1st number: 5/20, 2nd number: 1 6/21
5/20 - 27/21 is -29/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 21 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 20 × 21 = 420,
5/20 = 5 × 21/20 × 21 = 105/420 - Likewise, for the 2nd fraction, since 21 × 20 = 420,
27/21 = 27 × 20/21 × 20 = 540/420 - Subtract the two like fractions:
105/420 - 540/420 = 105 - 540/420 = -435/420 - After reducing the fraction, the answer is -29/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/20-27/21 5/20-54/21 5/40-27/21 5/20-27/42 15/20-27/21 5/20-81/21 5/60-27/21 5/20-27/63 25/20-27/21 35/20-27/21