Subtract 15/5 from 42/30
1st number: 1 12/30, 2nd number: 3 0/5
42/30 - 15/5 is -8/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 5 is 30
Next, find the equivalent fraction of both fractional numbers with denominator 30 - For the 1st fraction, since 30 × 1 = 30,
42/30 = 42 × 1/30 × 1 = 42/30 - Likewise, for the 2nd fraction, since 5 × 6 = 30,
15/5 = 15 × 6/5 × 6 = 90/30 - Subtract the two like fractions:
42/30 - 90/30 = 42 - 90/30 = -48/30 - After reducing the fraction, the answer is -8/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/30-15/5 42/30-30/5 42/60-15/5 42/30-15/10 42/30-45/5 42/90-15/5 42/30-75/5 42/30-15/25 42/30-15/35