Add 18/70 and 84/81
1st number: 18/70, 2nd number: 1 3/81
18/70 + 84/81 is 1223/945.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 81 is 5670
Next, find the equivalent fraction of both fractional numbers with denominator 5670 - For the 1st fraction, since 70 × 81 = 5670,
18/70 = 18 × 81/70 × 81 = 1458/5670 - Likewise, for the 2nd fraction, since 81 × 70 = 5670,
84/81 = 84 × 70/81 × 70 = 5880/5670 - Add the two like fractions:
1458/5670 + 5880/5670 = 1458 + 5880/5670 = 7338/5670 - 7338/5670 simplified gives 1223/945
- So, 18/70 + 84/81 = 1223/945
In mixed form: 1278/945
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/70+84/81 54/70+84/81 90/70+84/81