Subtract 45/80 from 70/20
1st number: 3 10/20, 2nd number: 45/80
70/20 - 45/80 is 47/16.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 80 is 80
Next, find the equivalent fraction of both fractional numbers with denominator 80 - For the 1st fraction, since 20 × 4 = 80,
70/20 = 70 × 4/20 × 4 = 280/80 - Likewise, for the 2nd fraction, since 80 × 1 = 80,
45/80 = 45 × 1/80 × 1 = 45/80 - Subtract the two like fractions:
280/80 - 45/80 = 280 - 45/80 = 235/80 - After reducing the fraction, the answer is 47/16
- In mixed form: 215/16
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/20-90/80 70/40-45/80 70/60-45/80