Subtract 27/21 from 84/12
1st number: 7 0/12, 2nd number: 1 6/21
84/12 - 27/21 is 40/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
84/12 = 84 × 7/12 × 7 = 588/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
27/21 = 27 × 4/21 × 4 = 108/84 - Subtract the two like fractions:
588/84 - 108/84 = 588 - 108/84 = 480/84 - After reducing the fraction, the answer is 40/7
- In mixed form: 55/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/12-54/21 84/24-27/21 84/12-27/42 84/12-81/21 84/36-27/21 84/12-27/63 84/60-27/21