Subtract 54/18 from 21/12
1st number: 1 9/12, 2nd number: 3 0/18
21/12 - 54/18 is -5/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 18 is 36
Next, find the equivalent fraction of both fractional numbers with denominator 36 - For the 1st fraction, since 12 × 3 = 36,
21/12 = 21 × 3/12 × 3 = 63/36 - Likewise, for the 2nd fraction, since 18 × 2 = 36,
54/18 = 54 × 2/18 × 2 = 108/36 - Subtract the two like fractions:
63/36 - 108/36 = 63 - 108/36 = -45/36 - After reducing the fraction, the answer is -5/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/12-54/18 21/24-54/18 21/12-54/36 63/12-54/18 21/36-54/18 21/60-54/18 21/12-54/90 21/84-54/18