Add 80/84 and 45/42
1st number: 80/84, 2nd number: 1 3/42
80/84 + 45/42 is 85/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 42 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 84 × 1 = 84,
80/84 = 80 × 1/84 × 1 = 80/84 - Likewise, for the 2nd fraction, since 42 × 2 = 84,
45/42 = 45 × 2/42 × 2 = 90/84 - Add the two like fractions:
80/84 + 90/84 = 80 + 90/84 = 170/84 - 170/84 simplified gives 85/42
- So, 80/84 + 45/42 = 85/42
In mixed form: 21/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/84+90/42 80/84+45/84