Subtract 16/20 from 4/9
4/9 - 16/20 is -16/45.
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,
16/20 = 16 × 9/20 × 9 = 144/180 - Subtract the two like fractions:
80/180 - 144/180 = 80 - 144/180 = -64/180 - After reducing the fraction, the answer is -16/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/9-16/20 4/9-32/20 4/18-16/20 4/9-16/40 12/9-16/20 4/9-48/20 4/27-16/20 4/9-16/60 20/9-16/20 4/9-80/20 4/45-16/20 28/9-16/20 4/63-16/20