Subtract 20/90 from 45/10
1st number: 4 5/10, 2nd number: 20/90
45/10 - 20/90 is 77/18.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 90 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 10 × 9 = 90,
45/10 = 45 × 9/10 × 9 = 405/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
20/90 = 20 × 1/90 × 1 = 20/90 - Subtract the two like fractions:
405/90 - 20/90 = 405 - 20/90 = 385/90 - After reducing the fraction, the answer is 77/18
- In mixed form: 45/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/10-20/90 45/10-40/90 45/20-20/90 45/10-60/90 45/30-20/90 45/50-20/90 45/70-20/90