Subtract 30/80 from 21/18
1st number: 1 3/18, 2nd number: 30/80
21/18 - 30/80 is 19/24.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 80 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 18 × 40 = 720,
21/18 = 21 × 40/18 × 40 = 840/720 - Likewise, for the 2nd fraction, since 80 × 9 = 720,
30/80 = 30 × 9/80 × 9 = 270/720 - Subtract the two like fractions:
840/720 - 270/720 = 840 - 270/720 = 570/720 - After reducing the fraction, the answer is 19/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/18-30/80 21/18-60/80 21/36-30/80 63/18-30/80 21/18-90/80 21/54-30/80 21/90-30/80