Subtract 21/27 from 45/60
45/60 - 21/27 is -1/36.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 60 and 27 is 540
Next, find the equivalent fraction of both fractional numbers with denominator 540 - For the 1st fraction, since 60 × 9 = 540,
45/60 = 45 × 9/60 × 9 = 405/540 - Likewise, for the 2nd fraction, since 27 × 20 = 540,
21/27 = 21 × 20/27 × 20 = 420/540 - Subtract the two like fractions:
405/540 - 420/540 = 405 - 420/540 = -15/540 - After reducing the fraction, the answer is -1/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/60-21/27 45/60-42/27 45/60-21/54 45/60-63/27 45/60-21/81