Subtract 1/30 from 18/28
18/28 - 1/30 is 64/105.
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,
1/30 = 1 × 14/30 × 14 = 14/420 - Subtract the two like fractions:
270/420 - 14/420 = 270 - 14/420 = 256/420 - After reducing the fraction, the answer is 64/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/28-1/30 18/28-2/30 18/56-1/30 18/28-1/60 54/28-1/30 18/28-3/30 18/84-1/30 18/28-1/90 90/28-1/30 18/28-5/30 18/28-7/30