Subtract 3/20 from 20/45
20/45 - 3/20 is 53/180.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 20 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 45 × 4 = 180,
20/45 = 20 × 4/45 × 4 = 80/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
3/20 = 3 × 9/20 × 9 = 27/180 - Subtract the two like fractions:
80/180 - 27/180 = 80 - 27/180 = 53/180
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/45-3/20 20/45-6/20 20/90-3/20 20/45-3/40 60/45-3/20 20/45-9/20 20/45-3/60 20/45-15/20 20/45-21/20