Subtract 42/18 from 20/8
1st number: 2 4/8, 2nd number: 2 6/18
20/8 - 42/18 is 1/6.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 18 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 8 × 9 = 72,
20/8 = 20 × 9/8 × 9 = 180/72 - Likewise, for the 2nd fraction, since 18 × 4 = 72,
42/18 = 42 × 4/18 × 4 = 168/72 - Subtract the two like fractions:
180/72 - 168/72 = 180 - 168/72 = 12/72 - After reducing the fraction, the answer is 1/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/8-42/18 20/8-84/18 20/16-42/18 20/8-42/36 60/8-42/18 20/24-42/18 20/8-42/54 20/40-42/18 20/8-42/90 20/56-42/18