Subtract 20/40 from 18/5
1st number: 3 3/5, 2nd number: 20/40
18/5 - 20/40 is 31/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 40 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 5 × 8 = 40,
18/5 = 18 × 8/5 × 8 = 144/40 - Likewise, for the 2nd fraction, since 40 × 1 = 40,
20/40 = 20 × 1/40 × 1 = 20/40 - Subtract the two like fractions:
144/40 - 20/40 = 144 - 20/40 = 124/40 - After reducing the fraction, the answer is 31/10
- In mixed form: 31/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/5-20/40 18/10-20/40 18/5-20/80 54/5-20/40 18/5-60/40 18/15-20/40 90/5-20/40 18/25-20/40 18/35-20/40