Subtract 12/30 from 18/28
18/28 - 12/30 is 17/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 30 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 28 × 15 = 420,
18/28 = 18 × 15/28 × 15 = 270/420 - Likewise, for the 2nd fraction, since 30 × 14 = 420,
12/30 = 12 × 14/30 × 14 = 168/420 - Subtract the two like fractions:
270/420 - 168/420 = 270 - 168/420 = 102/420 - After reducing the fraction, the answer is 17/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/28-12/30 18/28-24/30 18/56-12/30 18/28-12/60 54/28-12/30 18/28-36/30 18/84-12/30 18/28-12/90 90/28-12/30 18/28-60/30 18/28-84/30