Subtract 18/20 from 30/18
1st number: 1 12/18, 2nd number: 18/20
30/18 - 18/20 is 23/30.
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,
30/18 = 30 × 10/18 × 10 = 300/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
18/20 = 18 × 9/20 × 9 = 162/180 - Subtract the two like fractions:
300/180 - 162/180 = 300 - 162/180 = 138/180 - After reducing the fraction, the answer is 23/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/18-18/20 30/18-36/20 30/36-18/20 30/18-18/40 90/18-18/20 30/18-54/20 30/54-18/20 30/18-18/60 30/18-90/20 30/90-18/20