Subtract 18/8 from 10/20
1st number: 10/20, 2nd number: 2 2/8
10/20 - 18/8 is -7/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 8 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 20 × 2 = 40,
10/20 = 10 × 2/20 × 2 = 20/40 - Likewise, for the 2nd fraction, since 8 × 5 = 40,
18/8 = 18 × 5/8 × 5 = 90/40 - Subtract the two like fractions:
20/40 - 90/40 = 20 - 90/40 = -70/40 - 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: 10/20-36/8 10/40-18/8 10/20-18/16 30/20-18/8 10/20-54/8 10/60-18/8 10/20-18/24 50/20-18/8 10/20-90/8 10/20-18/40 70/20-18/8 10/20-18/56