Subtract 81/18 from 2/20
1st number: 2/20, 2nd number: 4 9/18
2/20 - 81/18 is -22/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 18 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 20 × 9 = 180,
2/20 = 2 × 9/20 × 9 = 18/180 - Likewise, for the 2nd fraction, since 18 × 10 = 180,
81/18 = 81 × 10/18 × 10 = 810/180 - Subtract the two like fractions:
18/180 - 810/180 = 18 - 810/180 = -792/180 - After reducing the fraction, the answer is -22/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/20-81/18 2/40-81/18 2/20-81/36 6/20-81/18 2/60-81/18 2/20-81/54 10/20-81/18 2/20-81/90 14/20-81/18