Subtract 20/80 from 35/21
1st number: 1 14/21, 2nd number: 20/80
35/21 - 20/80 is 17/12.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 80 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 21 × 80 = 1680,
35/21 = 35 × 80/21 × 80 = 2800/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
20/80 = 20 × 21/80 × 21 = 420/1680 - Subtract the two like fractions:
2800/1680 - 420/1680 = 2800 - 420/1680 = 2380/1680 - After reducing the fraction, the answer is 17/12
- In mixed form: 15/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/21-20/80 35/21-40/80 35/42-20/80 35/21-60/80 35/63-20/80