Subtract 5/45 from 1/20
1/20 - 5/45 is -11/180.
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,
1/20 = 1 × 9/20 × 9 = 9/180 - Likewise, for the 2nd fraction, since 45 × 4 = 180,
5/45 = 5 × 4/45 × 4 = 20/180 - Subtract the two like fractions:
9/180 - 20/180 = 9 - 20/180 = -11/180
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/20-5/45 1/20-10/45 1/40-5/45 1/20-5/90 3/20-5/45 1/20-15/45 1/60-5/45 5/20-5/45 1/20-25/45 7/20-5/45 1/20-35/45