Subtract 72/45 from 1/18
1st number: 1/18, 2nd number: 1 27/45
1/18 - 72/45 is -139/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 45 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 18 × 5 = 90,
1/18 = 1 × 5/18 × 5 = 5/90 - Likewise, for the 2nd fraction, since 45 × 2 = 90,
72/45 = 72 × 2/45 × 2 = 144/90 - Subtract the two like fractions:
5/90 - 144/90 = 5 - 144/90 = -139/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/18-72/45 1/36-72/45 1/18-72/90 3/18-72/45 1/54-72/45 5/18-72/45 1/90-72/45 7/18-72/45