Subtract 30/20 from 3/18
1st number: 3/18, 2nd number: 1 10/20
3/18 - 30/20 is -4/3.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 20 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 18 × 10 = 180,
3/18 = 3 × 10/18 × 10 = 30/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
30/20 = 30 × 9/20 × 9 = 270/180 - Subtract the two like fractions:
30/180 - 270/180 = 30 - 270/180 = -240/180 - After reducing the fraction, the answer is -4/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/18-30/20 3/18-60/20 3/36-30/20 3/18-30/40 9/18-30/20 3/18-90/20 3/54-30/20 3/18-30/60 15/18-30/20 3/90-30/20 21/18-30/20