Subtract 18/9 from 5/20
1st number: 5/20, 2nd number: 2 0/9
5/20 - 18/9 is -7/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 9 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 20 × 9 = 180,
5/20 = 5 × 9/20 × 9 = 45/180 - Likewise, for the 2nd fraction, since 9 × 20 = 180,
18/9 = 18 × 20/9 × 20 = 360/180 - Subtract the two like fractions:
45/180 - 360/180 = 45 - 360/180 = -315/180 - After reducing the fraction, the answer is -7/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/20-18/9 5/20-36/9 5/40-18/9 15/20-18/9 5/20-54/9 5/60-18/9 5/20-18/27 25/20-18/9 5/20-90/9 5/20-18/45 35/20-18/9 5/20-18/63