Add 90/81 and 36/70
1st number: 1 9/81, 2nd number: 36/70
90/81 + 36/70 is 512/315.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 70 is 5670
Next, find the equivalent fraction of both fractional numbers with denominator 5670 - For the 1st fraction, since 81 × 70 = 5670,
90/81 = 90 × 70/81 × 70 = 6300/5670 - Likewise, for the 2nd fraction, since 70 × 81 = 5670,
36/70 = 36 × 81/70 × 81 = 2916/5670 - Add the two like fractions:
6300/5670 + 2916/5670 = 6300 + 2916/5670 = 9216/5670 - 9216/5670 simplified gives 512/315
- So, 90/81 + 36/70 = 512/315
In mixed form: 1197/315
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/81+72/70