Add 81/12 and 84/70
1st number: 6 9/12, 2nd number: 1 14/70
81/12 + 84/70 is 159/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 70 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 12 × 35 = 420,
81/12 = 81 × 35/12 × 35 = 2835/420 - Likewise, for the 2nd fraction, since 70 × 6 = 420,
84/70 = 84 × 6/70 × 6 = 504/420 - Add the two like fractions:
2835/420 + 504/420 = 2835 + 504/420 = 3339/420 - 3339/420 simplified gives 159/20
- So, 81/12 + 84/70 = 159/20
In mixed form: 719/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/24+84/70 81/36+84/70 81/60+84/70 81/84+84/70