Subtract 20/80 from 90/5
1st number: 18 0/5, 2nd number: 20/80
90/5 - 20/80 is 71/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 80 is 80
Next, find the equivalent fraction of both fractional numbers with denominator 80 - For the 1st fraction, since 5 × 16 = 80,
90/5 = 90 × 16/5 × 16 = 1440/80 - Likewise, for the 2nd fraction, since 80 × 1 = 80,
20/80 = 20 × 1/80 × 1 = 20/80 - Subtract the two like fractions:
1440/80 - 20/80 = 1440 - 20/80 = 1420/80 - After reducing the fraction, the answer is 71/4
- In mixed form: 173/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/5-40/80 90/10-20/80 90/5-60/80 90/15-20/80 90/25-20/80 90/35-20/80