Subtract 15/90 from 1/7
1/7 - 15/90 is -1/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 7 × 90 = 630,
1/7 = 1 × 90/7 × 90 = 90/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
15/90 = 15 × 7/90 × 7 = 105/630 - Subtract the two like fractions:
90/630 - 105/630 = 90 - 105/630 = -15/630 - After reducing the fraction, the answer is -1/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/7-15/90 1/7-30/90 1/14-15/90 3/7-15/90 1/7-45/90 1/21-15/90 5/7-15/90 1/7-75/90 1/35-15/90 1/49-15/90