Add 84/80 and 42/12
1st number: 1 4/80, 2nd number: 3 6/12
84/80 + 42/12 is 91/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 12 is 240
Next, find the equivalent fraction of both fractional numbers with denominator 240 - For the 1st fraction, since 80 × 3 = 240,
84/80 = 84 × 3/80 × 3 = 252/240 - Likewise, for the 2nd fraction, since 12 × 20 = 240,
42/12 = 42 × 20/12 × 20 = 840/240 - Add the two like fractions:
252/240 + 840/240 = 252 + 840/240 = 1092/240 - 1092/240 simplified gives 91/20
- So, 84/80 + 42/12 = 91/20
In mixed form: 411/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/80+84/12 84/80+42/24 84/80+42/36 84/80+42/60 84/80+42/84