Subtract 54/18 from 2/21
1st number: 2/21, 2nd number: 3 0/18
2/21 - 54/18 is -61/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 18 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 21 × 6 = 126,
2/21 = 2 × 6/21 × 6 = 12/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
54/18 = 54 × 7/18 × 7 = 378/126 - Subtract the two like fractions:
12/126 - 378/126 = 12 - 378/126 = -366/126 - After reducing the fraction, the answer is -61/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/21-54/18 2/42-54/18 2/21-54/36 6/21-54/18 2/63-54/18 10/21-54/18 2/21-54/90 14/21-54/18