Subtract 18/28 from 3/30
3/30 - 18/28 is -19/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 28 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 30 × 14 = 420,
3/30 = 3 × 14/30 × 14 = 42/420 - Likewise, for the 2nd fraction, since 28 × 15 = 420,
18/28 = 18 × 15/28 × 15 = 270/420 - Subtract the two like fractions:
42/420 - 270/420 = 42 - 270/420 = -228/420 - After reducing the fraction, the answer is -19/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/30-18/28 3/30-36/28 3/60-18/28 3/30-18/56 9/30-18/28 3/30-54/28 3/90-18/28 3/30-18/84 15/30-18/28 3/30-90/28 21/30-18/28