Subtract 15/12 from 18/35
1st number: 18/35, 2nd number: 1 3/12
18/35 - 15/12 is -103/140.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 35 and 12 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 35 × 12 = 420,
18/35 = 18 × 12/35 × 12 = 216/420 - Likewise, for the 2nd fraction, since 12 × 35 = 420,
15/12 = 15 × 35/12 × 35 = 525/420 - Subtract the two like fractions:
216/420 - 525/420 = 216 - 525/420 = -309/420 - After reducing the fraction, the answer is -103/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/35-15/12 18/35-30/12 18/70-15/12 18/35-15/24 54/35-15/12 18/35-45/12 18/35-15/36 90/35-15/12 18/35-75/12 18/35-15/60 18/35-15/84