Subtract 42/18 from 27/80
1st number: 27/80, 2nd number: 2 6/18
27/80 - 42/18 is -479/240.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 18 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 80 × 9 = 720,
27/80 = 27 × 9/80 × 9 = 243/720 - Likewise, for the 2nd fraction, since 18 × 40 = 720,
42/18 = 42 × 40/18 × 40 = 1680/720 - Subtract the two like fractions:
243/720 - 1680/720 = 243 - 1680/720 = -1437/720 - After reducing the fraction, the answer is -479/240
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/80-42/18 27/80-84/18 27/80-42/36 81/80-42/18 27/80-42/54 27/80-42/90