Subtract 30/3 from 21/18
1st number: 1 3/18, 2nd number: 10 0/3
21/18 - 30/3 is -53/6.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 3 is 18
Next, find the equivalent fraction of both fractional numbers with denominator 18 - For the 1st fraction, since 18 × 1 = 18,
21/18 = 21 × 1/18 × 1 = 21/18 - Likewise, for the 2nd fraction, since 3 × 6 = 18,
30/3 = 30 × 6/3 × 6 = 180/18 - Subtract the two like fractions:
21/18 - 180/18 = 21 - 180/18 = -159/18 - After reducing the fraction, the answer is -53/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/18-30/3 21/18-60/3 21/36-30/3 21/18-30/6 63/18-30/3 21/18-90/3 21/54-30/3 21/18-30/9 21/90-30/3 21/18-30/15 21/18-30/21