Subtract 15/30 from 42/8
1st number: 5 2/8, 2nd number: 15/30
42/8 - 15/30 is 19/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 30 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 8 × 15 = 120,
42/8 = 42 × 15/8 × 15 = 630/120 - Likewise, for the 2nd fraction, since 30 × 4 = 120,
15/30 = 15 × 4/30 × 4 = 60/120 - Subtract the two like fractions:
630/120 - 60/120 = 630 - 60/120 = 570/120 - After reducing the fraction, the answer is 19/4
- In mixed form: 43/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/8-15/30 42/16-15/30 42/8-15/60 42/8-45/30 42/24-15/30 42/8-15/90 42/8-75/30 42/40-15/30 42/56-15/30