Add 4/42 and 80/20
1st number: 4/42, 2nd number: 4 0/20
4/42 + 80/20 is 86/21.
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,
4/42 = 4 × 10/42 × 10 = 40/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
80/20 = 80 × 21/20 × 21 = 1680/420 - Add the two like fractions:
40/420 + 1680/420 = 40 + 1680/420 = 1720/420 - 1720/420 simplified gives 86/21
- So, 4/42 + 80/20 = 86/21
In mixed form: 42/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/42+80/20 4/84+80/20 4/42+80/40 12/42+80/20 4/42+80/60 20/42+80/20 28/42+80/20