Answers

Add 70/81 and 21/63

70/81 + 21/63 is 97/81.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 81 and 63 is 567
   
   Next, find the equivalent fraction of both fractional numbers with denominator 567
2. For the 1st fraction, since 81 × 7 = 567,
   70/81 = 70 × 7/81 × 7 = 490/567
3. Likewise, for the 2nd fraction, since 63 × 9 = 567,
   21/63 = 21 × 9/63 × 9 = 189/567
4. Add the two like fractions:
   490/567 + 189/567 = 490 + 189/567 = 679/567
5. 679/567 simplified gives 97/81
6. So, 70/81 + 21/63 = 97/81
   In mixed form: 116/81

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad

Related: ⁷⁰/₈₁+⁴²/₆₃

Add Fractions Calculator