Subtract 10/90 from 9/42
9/42 - 10/90 is 13/126.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 42 × 15 = 630,
9/42 = 9 × 15/42 × 15 = 135/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
10/90 = 10 × 7/90 × 7 = 70/630 - Subtract the two like fractions:
135/630 - 70/630 = 135 - 70/630 = 65/630 - After reducing the fraction, the answer is 13/126
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/42-10/90 9/42-20/90 9/84-10/90 27/42-10/90 9/42-30/90 45/42-10/90 9/42-50/90 63/42-10/90 9/42-70/90