Subtract 42/20 from 30/12
1st number: 2 6/12, 2nd number: 2 2/20
30/12 - 42/20 is 2/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 20 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 12 × 5 = 60,
30/12 = 30 × 5/12 × 5 = 150/60 - Likewise, for the 2nd fraction, since 20 × 3 = 60,
42/20 = 42 × 3/20 × 3 = 126/60 - Subtract the two like fractions:
150/60 - 126/60 = 150 - 126/60 = 24/60 - After reducing the fraction, the answer is 2/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/12-42/20 30/12-84/20 30/24-42/20 30/12-42/40 90/12-42/20 30/36-42/20 30/12-42/60 30/60-42/20 30/84-42/20