Subtract 40/9 from 30/18
1st number: 1 12/18, 2nd number: 4 4/9
30/18 - 40/9 is -25/9.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 9 is 18
Next, find the equivalent fraction of both fractional numbers with denominator 18 - For the 1st fraction, since 18 × 1 = 18,
30/18 = 30 × 1/18 × 1 = 30/18 - Likewise, for the 2nd fraction, since 9 × 2 = 18,
40/9 = 40 × 2/9 × 2 = 80/18 - Subtract the two like fractions:
30/18 - 80/18 = 30 - 80/18 = -50/18 - After reducing the fraction, the answer is -25/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/18-40/9 30/18-80/9 30/36-40/9 30/18-40/18 90/18-40/9 30/54-40/9 30/18-40/27 30/90-40/9 30/18-40/45 30/18-40/63