Subtract 80/18 from 90/30
1st number: 3 0/30, 2nd number: 4 8/18
90/30 - 80/18 is -13/9.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 18 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 30 × 3 = 90,
90/30 = 90 × 3/30 × 3 = 270/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
80/18 = 80 × 5/18 × 5 = 400/90 - Subtract the two like fractions:
270/90 - 400/90 = 270 - 400/90 = -130/90 - After reducing the fraction, the answer is -13/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/60-80/18 90/30-80/36 90/30-80/54 90/30-80/90