Add 20/42 and 80/20
1st number: 20/42, 2nd number: 4 0/20
20/42 + 80/20 is 94/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 42 × 10 = 420,
20/42 = 20 × 10/42 × 10 = 200/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
80/20 = 80 × 21/20 × 21 = 1680/420 - Add the two like fractions:
200/420 + 1680/420 = 200 + 1680/420 = 1880/420 - 1880/420 simplified gives 94/21
- So, 20/42 + 80/20 = 94/21
In mixed form: 410/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/42+80/20 20/84+80/20 20/42+80/40 60/42+80/20 20/42+80/60