Subtract 8/20 from 4/9
4/9 - 8/20 is 2/45.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 20 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 9 × 20 = 180,
4/9 = 4 × 20/9 × 20 = 80/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
8/20 = 8 × 9/20 × 9 = 72/180 - Subtract the two like fractions:
80/180 - 72/180 = 80 - 72/180 = 8/180 - After reducing the fraction, the answer is 2/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/9-8/20 4/9-16/20 4/18-8/20 4/9-8/40 12/9-8/20 4/9-24/20 4/27-8/20 4/9-8/60 20/9-8/20 4/9-40/20 4/45-8/20 28/9-8/20 4/9-56/20 4/63-8/20