Subtract 80/18 from 27/21
1st number: 1 6/21, 2nd number: 4 8/18
27/21 - 80/18 is -199/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 18 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 21 × 6 = 126,
27/21 = 27 × 6/21 × 6 = 162/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
80/18 = 80 × 7/18 × 7 = 560/126 - Subtract the two like fractions:
162/126 - 560/126 = 162 - 560/126 = -398/126 - After reducing the fraction, the answer is -199/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/21-80/18 27/42-80/18 27/21-80/36 81/21-80/18 27/63-80/18 27/21-80/54 27/21-80/90