Subtract 8/90 from 20/12
1st number: 1 8/12, 2nd number: 8/90
20/12 - 8/90 is 71/45.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 90 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 12 × 15 = 180,
20/12 = 20 × 15/12 × 15 = 300/180 - Likewise, for the 2nd fraction, since 90 × 2 = 180,
8/90 = 8 × 2/90 × 2 = 16/180 - Subtract the two like fractions:
300/180 - 16/180 = 300 - 16/180 = 284/180 - After reducing the fraction, the answer is 71/45
- In mixed form: 126/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/12-8/90 20/12-16/90 20/24-8/90 60/12-8/90 20/12-24/90 20/36-8/90 20/12-40/90 20/60-8/90 20/12-56/90 20/84-8/90