Subtract 21/18 from 30/2
1st number: 15 0/2, 2nd number: 1 3/18
30/2 - 21/18 is 83/6.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 18 is 18
Next, find the equivalent fraction of both fractional numbers with denominator 18 - For the 1st fraction, since 2 × 9 = 18,
30/2 = 30 × 9/2 × 9 = 270/18 - Likewise, for the 2nd fraction, since 18 × 1 = 18,
21/18 = 21 × 1/18 × 1 = 21/18 - Subtract the two like fractions:
270/18 - 21/18 = 270 - 21/18 = 249/18 - After reducing the fraction, the answer is 83/6
- In mixed form: 135/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/2-21/18 30/2-42/18 30/4-21/18 30/2-21/36 90/2-21/18 30/2-63/18 30/6-21/18 30/2-21/54 30/10-21/18 30/2-21/90 30/14-21/18