Subtract 90/70 from 5/18
1st number: 5/18, 2nd number: 1 20/70
5/18 - 90/70 is -127/126.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 70 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 18 × 35 = 630,
5/18 = 5 × 35/18 × 35 = 175/630 - Likewise, for the 2nd fraction, since 70 × 9 = 630,
90/70 = 90 × 9/70 × 9 = 810/630 - Subtract the two like fractions:
175/630 - 810/630 = 175 - 810/630 = -635/630 - After reducing the fraction, the answer is -127/126
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/18-90/70 5/36-90/70 15/18-90/70 5/54-90/70 25/18-90/70 5/90-90/70 35/18-90/70