Subtract 84/18 from 45/21
1st number: 2 3/21, 2nd number: 4 12/18
45/21 - 84/18 is -53/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 18 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 21 × 6 = 126,
45/21 = 45 × 6/21 × 6 = 270/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
84/18 = 84 × 7/18 × 7 = 588/126 - Subtract the two like fractions:
270/126 - 588/126 = 270 - 588/126 = -318/126 - After reducing the fraction, the answer is -53/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/21-84/18 45/42-84/18 45/21-84/36 45/63-84/18 45/21-84/54 45/21-84/90