Subtract 75/45 from 15/42
1st number: 15/42, 2nd number: 1 30/45
15/42 - 75/45 is -55/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 45 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 42 × 15 = 630,
15/42 = 15 × 15/42 × 15 = 225/630 - Likewise, for the 2nd fraction, since 45 × 14 = 630,
75/45 = 75 × 14/45 × 14 = 1050/630 - Subtract the two like fractions:
225/630 - 1050/630 = 225 - 1050/630 = -825/630 - After reducing the fraction, the answer is -55/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/42-75/45 15/84-75/45 15/42-75/90 45/42-75/45 75/42-75/45