Subtract 20/18 from 5/45
1st number: 5/45, 2nd number: 1 2/18
5/45 - 20/18 is -1/1.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 18 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 45 × 2 = 90,
5/45 = 5 × 2/45 × 2 = 10/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
20/18 = 20 × 5/18 × 5 = 100/90 - Subtract the two like fractions:
10/90 - 100/90 = 10 - 100/90 = -90/90 - After reducing the fraction, the answer is -1/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/45-20/18 5/45-40/18 5/90-20/18 5/45-20/36 15/45-20/18 5/45-60/18 5/45-20/54 25/45-20/18 5/45-20/90 35/45-20/18