Subtract 18/12 from 27/30
1st number: 27/30, 2nd number: 1 6/12
27/30 - 18/12 is -3/5.
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,
27/30 = 27 × 2/30 × 2 = 54/60 - Likewise, for the 2nd fraction, since 12 × 5 = 60,
18/12 = 18 × 5/12 × 5 = 90/60 - Subtract the two like fractions:
54/60 - 90/60 = 54 - 90/60 = -36/60 - After reducing the fraction, the answer is -3/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/30-18/12 27/30-36/12 27/60-18/12 27/30-18/24 81/30-18/12 27/30-54/12 27/90-18/12 27/30-18/36 27/30-90/12 27/30-18/60 27/30-18/84