Subtract 30/12 from 18/28
1st number: 18/28, 2nd number: 2 6/12
18/28 - 30/12 is -13/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 12 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 28 × 3 = 84,
18/28 = 18 × 3/28 × 3 = 54/84 - Likewise, for the 2nd fraction, since 12 × 7 = 84,
30/12 = 30 × 7/12 × 7 = 210/84 - Subtract the two like fractions:
54/84 - 210/84 = 54 - 210/84 = -156/84 - After reducing the fraction, the answer is -13/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/28-30/12 18/28-60/12 18/56-30/12 18/28-30/24 54/28-30/12 18/28-90/12 18/84-30/12 18/28-30/36 90/28-30/12 18/28-30/60 18/28-30/84