Subtract 3/12 from 42/30
1st number: 1 12/30, 2nd number: 3/12
42/30 - 3/12 is 23/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 12 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 30 × 2 = 60,
42/30 = 42 × 2/30 × 2 = 84/60 - Likewise, for the 2nd fraction, since 12 × 5 = 60,
3/12 = 3 × 5/12 × 5 = 15/60 - Subtract the two like fractions:
84/60 - 15/60 = 84 - 15/60 = 69/60 - After reducing the fraction, the answer is 23/20
- In mixed form: 13/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/30-3/12 42/30-6/12 42/60-3/12 42/30-3/24 42/30-9/12 42/90-3/12 42/30-3/36 42/30-15/12 42/30-3/60 42/30-21/12 42/30-3/84