Subtract 20/45 from 1/5
1/5 - 20/45 is -11/45.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 45 is 45
Next, find the equivalent fraction of both fractional numbers with denominator 45 - For the 1st fraction, since 5 × 9 = 45,
1/5 = 1 × 9/5 × 9 = 9/45 - Likewise, for the 2nd fraction, since 45 × 1 = 45,
20/45 = 20 × 1/45 × 1 = 20/45 - Subtract the two like fractions:
9/45 - 20/45 = 9 - 20/45 = -11/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/5-20/45 1/5-40/45 1/10-20/45 1/5-20/90 3/5-20/45 1/5-60/45 1/15-20/45 1/25-20/45 7/5-20/45 1/35-20/45