Subtract 18/7 from 28/12
1st number: 2 4/12, 2nd number: 2 4/7
28/12 - 18/7 is -5/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 7 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
28/12 = 28 × 7/12 × 7 = 196/84 - Likewise, for the 2nd fraction, since 7 × 12 = 84,
18/7 = 18 × 12/7 × 12 = 216/84 - Subtract the two like fractions:
196/84 - 216/84 = 196 - 216/84 = -20/84 - After reducing the fraction, the answer is -5/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/12-18/7 28/12-36/7 28/24-18/7 28/12-18/14 84/12-18/7 28/12-54/7 28/36-18/7 28/12-18/21 28/12-90/7 28/60-18/7 28/12-18/35 28/84-18/7 28/12-18/49