Subtract 4/18 from 20/70
20/70 - 4/18 is 4/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 18 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 70 × 9 = 630,
20/70 = 20 × 9/70 × 9 = 180/630 - Likewise, for the 2nd fraction, since 18 × 35 = 630,
4/18 = 4 × 35/18 × 35 = 140/630 - Subtract the two like fractions:
180/630 - 140/630 = 180 - 140/630 = 40/630 - After reducing the fraction, the answer is 4/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/70-4/18 20/70-8/18 20/70-4/36 60/70-4/18 20/70-12/18 20/70-4/54 20/70-20/18 20/70-4/90 20/70-28/18