Subtract 27/40 from 21/60
21/60 - 27/40 is -13/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 60 and 40 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 60 × 2 = 120,
21/60 = 21 × 2/60 × 2 = 42/120 - Likewise, for the 2nd fraction, since 40 × 3 = 120,
27/40 = 27 × 3/40 × 3 = 81/120 - Subtract the two like fractions:
42/120 - 81/120 = 42 - 81/120 = -39/120 - After reducing the fraction, the answer is -13/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/60-27/40 21/60-54/40 21/60-27/80 63/60-27/40 21/60-81/40