Subtract 21/12 from 54/30
1st number: 1 24/30, 2nd number: 1 9/12
54/30 - 21/12 is 1/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 12 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 30 × 2 = 60,
54/30 = 54 × 2/30 × 2 = 108/60 - Likewise, for the 2nd fraction, since 12 × 5 = 60,
21/12 = 21 × 5/12 × 5 = 105/60 - Subtract the two like fractions:
108/60 - 105/60 = 108 - 105/60 = 3/60 - After reducing the fraction, the answer is 1/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/30-42/12 54/60-21/12 54/30-21/24 54/30-63/12 54/90-21/12 54/30-21/36 54/30-21/60 54/30-21/84