Subtract 6/42 from 1/90
1/90 - 6/42 is -83/630.
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,
1/90 = 1 × 7/90 × 7 = 7/630 - Likewise, for the 2nd fraction, since 42 × 15 = 630,
6/42 = 6 × 15/42 × 15 = 90/630 - Subtract the two like fractions:
7/630 - 90/630 = 7 - 90/630 = -83/630
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/90-6/42 1/90-12/42 1/90-6/84 3/90-6/42 1/90-18/42 5/90-6/42 1/90-30/42 7/90-6/42