Subtract 20/18 from 8/45
1st number: 8/45, 2nd number: 1 2/18
8/45 - 20/18 is -14/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 18 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 45 × 2 = 90,
8/45 = 8 × 2/45 × 2 = 16/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
20/18 = 20 × 5/18 × 5 = 100/90 - Subtract the two like fractions:
16/90 - 100/90 = 16 - 100/90 = -84/90 - After reducing the fraction, the answer is -14/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/45-20/18 8/45-40/18 8/90-20/18 8/45-20/36 24/45-20/18 8/45-60/18 8/45-20/54 40/45-20/18 8/45-20/90 56/45-20/18