Subtract 5/90 from 50/70
50/70 - 5/90 is 83/126.
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,
50/70 = 50 × 9/70 × 9 = 450/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
5/90 = 5 × 7/90 × 7 = 35/630 - Subtract the two like fractions:
450/630 - 35/630 = 450 - 35/630 = 415/630 - After reducing the fraction, the answer is 83/126
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/70-10/90 50/70-15/90 50/70-25/90 50/70-35/90