Subtract 15/42 from 6/90
6/90 - 15/42 is -61/210.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 42 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 90 × 7 = 630,
6/90 = 6 × 7/90 × 7 = 42/630 - Likewise, for the 2nd fraction, since 42 × 15 = 630,
15/42 = 15 × 15/42 × 15 = 225/630 - Subtract the two like fractions:
42/630 - 225/630 = 42 - 225/630 = -183/630 - After reducing the fraction, the answer is -61/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/90-15/42 6/90-30/42 6/90-15/84 18/90-15/42 6/90-45/42 30/90-15/42 6/90-75/42 42/90-15/42