Subtract 21/12 from 18/35
1st number: 18/35, 2nd number: 1 9/12
18/35 - 21/12 is -173/140.
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,
21/12 = 21 × 35/12 × 35 = 735/420 - Subtract the two like fractions:
216/420 - 735/420 = 216 - 735/420 = -519/420 - After reducing the fraction, the answer is -173/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/35-21/12 18/35-42/12 18/70-21/12 18/35-21/24 54/35-21/12 18/35-63/12 18/35-21/36 90/35-21/12 18/35-21/60 18/35-21/84