Subtract 30/18 from 15/80
1st number: 15/80, 2nd number: 1 12/18
15/80 - 30/18 is -71/48.
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,
15/80 = 15 × 9/80 × 9 = 135/720 - Likewise, for the 2nd fraction, since 18 × 40 = 720,
30/18 = 30 × 40/18 × 40 = 1200/720 - Subtract the two like fractions:
135/720 - 1200/720 = 135 - 1200/720 = -1065/720 - After reducing the fraction, the answer is -71/48
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/80-30/18 15/80-60/18 15/80-30/36 45/80-30/18 15/80-90/18 15/80-30/54 75/80-30/18 15/80-30/90