Subtract 10/5 from 18/40
1st number: 18/40, 2nd number: 2 0/5
18/40 - 10/5 is -31/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 5 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 40 × 1 = 40,
18/40 = 18 × 1/40 × 1 = 18/40 - Likewise, for the 2nd fraction, since 5 × 8 = 40,
10/5 = 10 × 8/5 × 8 = 80/40 - Subtract the two like fractions:
18/40 - 80/40 = 18 - 80/40 = -62/40 - After reducing the fraction, the answer is -31/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/40-10/5 18/40-20/5 18/80-10/5 54/40-10/5 18/40-30/5 18/40-10/15 90/40-10/5 18/40-50/5 18/40-10/25 18/40-70/5 18/40-10/35