Subtract 75/21 from 84/18
1st number: 4 12/18, 2nd number: 3 12/21
84/18 - 75/21 is 23/21.
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,
75/21 = 75 × 6/21 × 6 = 450/126 - Subtract the two like fractions:
588/126 - 450/126 = 588 - 450/126 = 138/126 - After reducing the fraction, the answer is 23/21
- In mixed form: 12/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/36-75/21 84/18-75/42 84/54-75/21 84/18-75/63 84/90-75/21