Subtract 20/45 from 6/20
6/20 - 20/45 is -13/90.
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,
6/20 = 6 × 9/20 × 9 = 54/180 - Likewise, for the 2nd fraction, since 45 × 4 = 180,
20/45 = 20 × 4/45 × 4 = 80/180 - Subtract the two like fractions:
54/180 - 80/180 = 54 - 80/180 = -26/180 - After reducing the fraction, the answer is -13/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/20-20/45 6/20-40/45 6/40-20/45 6/20-20/90 18/20-20/45 6/20-60/45 6/60-20/45 30/20-20/45 42/20-20/45