Subtract 5/80 from 30/18
1st number: 1 12/18, 2nd number: 5/80
30/18 - 5/80 is 77/48.
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,
30/18 = 30 × 40/18 × 40 = 1200/720 - Likewise, for the 2nd fraction, since 80 × 9 = 720,
5/80 = 5 × 9/80 × 9 = 45/720 - Subtract the two like fractions:
1200/720 - 45/720 = 1200 - 45/720 = 1155/720 - After reducing the fraction, the answer is 77/48
- In mixed form: 129/48
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/18-5/80 30/18-10/80 30/36-5/80 90/18-5/80 30/18-15/80 30/54-5/80 30/18-25/80 30/90-5/80 30/18-35/80