Subtract 21/20 from 54/12
1st number: 4 6/12, 2nd number: 1 1/20
54/12 - 21/20 is 69/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 20 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 12 × 5 = 60,
54/12 = 54 × 5/12 × 5 = 270/60 - Likewise, for the 2nd fraction, since 20 × 3 = 60,
21/20 = 21 × 3/20 × 3 = 63/60 - Subtract the two like fractions:
270/60 - 63/60 = 270 - 63/60 = 207/60 - After reducing the fraction, the answer is 69/20
- In mixed form: 39/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/12-42/20 54/24-21/20 54/12-21/40 54/12-63/20 54/36-21/20 54/12-21/60 54/60-21/20 54/84-21/20