Subtract 7/42 from 84/18
1st number: 4 12/18, 2nd number: 7/42
84/18 - 7/42 is 9/2.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 42 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 42 × 3 = 126,
7/42 = 7 × 3/42 × 3 = 21/126 - Subtract the two like fractions:
588/126 - 21/126 = 588 - 21/126 = 567/126 - After reducing the fraction, the answer is 9/2
- In mixed form: 41/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/18-14/42 84/36-7/42 84/18-7/84 84/18-21/42 84/54-7/42 84/18-35/42 84/90-7/42 84/18-49/42