Subtract 5/21 from 84/18
1st number: 4 12/18, 2nd number: 5/21
84/18 - 5/21 is 31/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 21 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 18 × 7 = 126,
84/18 = 84 × 7/18 × 7 = 588/126 - Likewise, for the 2nd fraction, since 21 × 6 = 126,
5/21 = 5 × 6/21 × 6 = 30/126 - Subtract the two like fractions:
588/126 - 30/126 = 588 - 30/126 = 558/126 - After reducing the fraction, the answer is 31/7
- In mixed form: 43/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/18-10/21 84/36-5/21 84/18-5/42 84/18-15/21 84/54-5/21 84/18-5/63 84/18-25/21 84/90-5/21 84/18-35/21