Subtract 1/20 from 9/18
9/18 - 1/20 is 9/20.
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,
9/18 = 9 × 10/18 × 10 = 90/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
1/20 = 1 × 9/20 × 9 = 9/180 - Subtract the two like fractions:
90/180 - 9/180 = 90 - 9/180 = 81/180 - After reducing the fraction, the answer is 9/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 9/18-2/20 9/36-1/20 9/18-1/40 27/18-1/20 9/18-3/20 9/54-1/20 9/18-1/60 45/18-1/20 9/18-5/20 9/90-1/20 63/18-1/20 9/18-7/20