Add 20/81 and 70/7
1st number: 20/81, 2nd number: 10 0/7
20/81 + 70/7 is 830/81.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 7 is 567
Next, find the equivalent fraction of both fractional numbers with denominator 567 - For the 1st fraction, since 81 × 7 = 567,
20/81 = 20 × 7/81 × 7 = 140/567 - Likewise, for the 2nd fraction, since 7 × 81 = 567,
70/7 = 70 × 81/7 × 81 = 5670/567 - Add the two like fractions:
140/567 + 5670/567 = 140 + 5670/567 = 5810/567 - 5810/567 simplified gives 830/81
- So, 20/81 + 70/7 = 830/81
In mixed form: 1020/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/81+70/7 20/81+70/14 60/81+70/7 20/81+70/21 20/81+70/35 20/81+70/49