Subtract 7/45 from 30/18
1st number: 1 12/18, 2nd number: 7/45
30/18 - 7/45 is 68/45.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 45 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 18 × 5 = 90,
30/18 = 30 × 5/18 × 5 = 150/90 - Likewise, for the 2nd fraction, since 45 × 2 = 90,
7/45 = 7 × 2/45 × 2 = 14/90 - Subtract the two like fractions:
150/90 - 14/90 = 150 - 14/90 = 136/90 - After reducing the fraction, the answer is 68/45
- In mixed form: 123/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/18-7/45 30/18-14/45 30/36-7/45 30/18-7/90 90/18-7/45 30/18-21/45 30/54-7/45 30/18-35/45 30/90-7/45 30/18-49/45