Add 70/84 and 45/12
1st number: 70/84, 2nd number: 3 9/12
70/84 + 45/12 is 55/12.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 12 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 84 × 1 = 84,
70/84 = 70 × 1/84 × 1 = 70/84 - Likewise, for the 2nd fraction, since 12 × 7 = 84,
45/12 = 45 × 7/12 × 7 = 315/84 - Add the two like fractions:
70/84 + 315/84 = 70 + 315/84 = 385/84 - 385/84 simplified gives 55/12
- So, 70/84 + 45/12 = 55/12
In mixed form: 47/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/84+90/12 70/84+45/24 70/84+45/36 70/84+45/60 70/84+45/84