Subtract 20/70 from 8/18
8/18 - 20/70 is 10/63.
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,
8/18 = 8 × 35/18 × 35 = 280/630 - Likewise, for the 2nd fraction, since 70 × 9 = 630,
20/70 = 20 × 9/70 × 9 = 180/630 - Subtract the two like fractions:
280/630 - 180/630 = 280 - 180/630 = 100/630 - After reducing the fraction, the answer is 10/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/18-20/70 8/18-40/70 8/36-20/70 24/18-20/70 8/18-60/70 8/54-20/70 40/18-20/70 8/90-20/70 56/18-20/70