Subtract 8/45 from 18/20
18/20 - 8/45 is 13/18.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 45 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 20 × 9 = 180,
18/20 = 18 × 9/20 × 9 = 162/180 - Likewise, for the 2nd fraction, since 45 × 4 = 180,
8/45 = 8 × 4/45 × 4 = 32/180 - Subtract the two like fractions:
162/180 - 32/180 = 162 - 32/180 = 130/180 - After reducing the fraction, the answer is 13/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/20-8/45 18/20-16/45 18/40-8/45 18/20-8/90 54/20-8/45 18/20-24/45 18/60-8/45 90/20-8/45 18/20-40/45 18/20-56/45