Subtract 21/4 from 54/18
1st number: 3 0/18, 2nd number: 5 1/4
54/18 - 21/4 is -9/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 4 is 36
Next, find the equivalent fraction of both fractional numbers with denominator 36 - For the 1st fraction, since 18 × 2 = 36,
54/18 = 54 × 2/18 × 2 = 108/36 - Likewise, for the 2nd fraction, since 4 × 9 = 36,
21/4 = 21 × 9/4 × 9 = 189/36 - Subtract the two like fractions:
108/36 - 189/36 = 108 - 189/36 = -81/36 - After reducing the fraction, the answer is -9/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/18-42/4 54/36-21/4 54/18-21/8 54/18-63/4 54/18-21/12 54/90-21/4 54/18-21/20 54/18-21/28