Subtract 42/10 from 45/12
1st number: 3 9/12, 2nd number: 4 2/10
45/12 - 42/10 is -9/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 10 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 12 × 5 = 60,
45/12 = 45 × 5/12 × 5 = 225/60 - Likewise, for the 2nd fraction, since 10 × 6 = 60,
42/10 = 42 × 6/10 × 6 = 252/60 - Subtract the two like fractions:
225/60 - 252/60 = 225 - 252/60 = -27/60 - After reducing the fraction, the answer is -9/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/12-42/10 45/12-84/10 45/24-42/10 45/12-42/20 45/36-42/10 45/12-42/30 45/60-42/10 45/12-42/50 45/84-42/10 45/12-42/70