Subtract 20/42 from 54/18
1st number: 3 0/18, 2nd number: 20/42
54/18 - 20/42 is 53/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 42 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 18 × 7 = 126,
54/18 = 54 × 7/18 × 7 = 378/126 - Likewise, for the 2nd fraction, since 42 × 3 = 126,
20/42 = 20 × 3/42 × 3 = 60/126 - Subtract the two like fractions:
378/126 - 60/126 = 378 - 60/126 = 318/126 - After reducing the fraction, the answer is 53/21
- In mixed form: 211/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/18-40/42 54/36-20/42 54/18-20/84 54/18-60/42 54/90-20/42