Subtract 1/15 from 20/45
20/45 - 1/15 is 17/45.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 15 is 45
Next, find the equivalent fraction of both fractional numbers with denominator 45 - For the 1st fraction, since 45 × 1 = 45,
20/45 = 20 × 1/45 × 1 = 20/45 - Likewise, for the 2nd fraction, since 15 × 3 = 45,
1/15 = 1 × 3/15 × 3 = 3/45 - Subtract the two like fractions:
20/45 - 3/45 = 20 - 3/45 = 17/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/45-1/15 20/45-2/15 20/90-1/15 20/45-1/30 60/45-1/15 20/45-3/15 20/45-1/45 20/45-5/15 20/45-1/75 20/45-7/15