Subtract 12/18 from 42/20
1st number: 2 2/20, 2nd number: 12/18
42/20 - 12/18 is 43/30.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 18 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 20 × 9 = 180,
42/20 = 42 × 9/20 × 9 = 378/180 - Likewise, for the 2nd fraction, since 18 × 10 = 180,
12/18 = 12 × 10/18 × 10 = 120/180 - Subtract the two like fractions:
378/180 - 120/180 = 378 - 120/180 = 258/180 - After reducing the fraction, the answer is 43/30
- In mixed form: 113/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/20-12/18 42/20-24/18 42/40-12/18 42/20-12/36 42/20-36/18 42/60-12/18 42/20-12/54 42/20-60/18 42/20-12/90 42/20-84/18