Add 84/4 and 42/80
1st number: 21 0/4, 2nd number: 42/80
84/4 + 42/80 is 861/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 80 is 80
Next, find the equivalent fraction of both fractional numbers with denominator 80 - For the 1st fraction, since 4 × 20 = 80,
84/4 = 84 × 20/4 × 20 = 1680/80 - Likewise, for the 2nd fraction, since 80 × 1 = 80,
42/80 = 42 × 1/80 × 1 = 42/80 - Add the two like fractions:
1680/80 + 42/80 = 1680 + 42/80 = 1722/80 - 1722/80 simplified gives 861/40
- So, 84/4 + 42/80 = 861/40
In mixed form: 2121/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/4+84/80 84/8+42/80 84/12+42/80 84/20+42/80 84/28+42/80