Subtract 2/90 from 1/42
1/42 - 2/90 is 1/630.
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,
1/42 = 1 × 15/42 × 15 = 15/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
2/90 = 2 × 7/90 × 7 = 14/630 - Subtract the two like fractions:
15/630 - 14/630 = 15 - 14/630 = 1/630
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/42-2/90 1/42-4/90 1/84-2/90 3/42-2/90 1/42-6/90 5/42-2/90 1/42-10/90 7/42-2/90 1/42-14/90