Subtract 15/18 from 21/60
21/60 - 15/18 is -29/60.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 60 and 18 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 60 × 3 = 180,
21/60 = 21 × 3/60 × 3 = 63/180 - Likewise, for the 2nd fraction, since 18 × 10 = 180,
15/18 = 15 × 10/18 × 10 = 150/180 - Subtract the two like fractions:
63/180 - 150/180 = 63 - 150/180 = -87/180 - After reducing the fraction, the answer is -29/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/60-15/18 21/60-30/18 21/60-15/36 63/60-15/18 21/60-45/18 21/60-15/54 21/60-75/18 21/60-15/90