Subtract 27/21 from 25/20
1st number: 1 5/20, 2nd number: 1 6/21
25/20 - 27/21 is -1/28.
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,
25/20 = 25 × 21/20 × 21 = 525/420 - Likewise, for the 2nd fraction, since 21 × 20 = 420,
27/21 = 27 × 20/21 × 20 = 540/420 - Subtract the two like fractions:
525/420 - 540/420 = 525 - 540/420 = -15/420 - After reducing the fraction, the answer is -1/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/20-27/21 25/20-54/21 25/40-27/21 25/20-27/42 75/20-27/21 25/20-81/21 25/60-27/21 25/20-27/63