Subtract 81/18 from 18/60
1st number: 18/60, 2nd number: 4 9/18
18/60 - 81/18 is -21/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 60 and 18 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 60 × 3 = 180,
18/60 = 18 × 3/60 × 3 = 54/180 - Likewise, for the 2nd fraction, since 18 × 10 = 180,
81/18 = 81 × 10/18 × 10 = 810/180 - Subtract the two like fractions:
54/180 - 810/180 = 54 - 810/180 = -756/180 - After reducing the fraction, the answer is -21/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/60-81/18 18/60-81/36 54/60-81/18 18/60-81/54 90/60-81/18 18/60-81/90