Subtract 21/18 from 3/80
1st number: 3/80, 2nd number: 1 3/18
3/80 - 21/18 is -271/240.
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,
3/80 = 3 × 9/80 × 9 = 27/720 - Likewise, for the 2nd fraction, since 18 × 40 = 720,
21/18 = 21 × 40/18 × 40 = 840/720 - Subtract the two like fractions:
27/720 - 840/720 = 27 - 840/720 = -813/720 - After reducing the fraction, the answer is -271/240
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/80-21/18 3/80-42/18 3/80-21/36 9/80-21/18 3/80-63/18 3/80-21/54 15/80-21/18 3/80-21/90 21/80-21/18