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