Subtract 4/90 from 10/70
10/70 - 4/90 is 31/315.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 70 × 9 = 630,
10/70 = 10 × 9/70 × 9 = 90/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
4/90 = 4 × 7/90 × 7 = 28/630 - Subtract the two like fractions:
90/630 - 28/630 = 90 - 28/630 = 62/630 - After reducing the fraction, the answer is 31/315
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/70-4/90 10/70-8/90 30/70-4/90 10/70-12/90 50/70-4/90 10/70-20/90 10/70-28/90