Answers

Add 21/81 and 90/56

1^st number: 21/81, 2^nd number: 1 34/56

21/81 + 90/56 is 1411/756.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 81 and 56 is 4536
   
   Next, find the equivalent fraction of both fractional numbers with denominator 4536
2. For the 1st fraction, since 81 × 56 = 4536,
   21/81 = 21 × 56/81 × 56 = 1176/4536
3. Likewise, for the 2nd fraction, since 56 × 81 = 4536,
   90/56 = 90 × 81/56 × 81 = 7290/4536
4. Add the two like fractions:
   1176/4536 + 7290/4536 = 1176 + 7290/4536 = 8466/4536
5. 8466/4536 simplified gives 1411/756
6. So, 21/81 + 90/56 = 1411/756
   In mixed form: 1655/756

MathStep (Works offline)

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

Related: ⁴²/₈₁+⁹⁰/₅₆ ⁶³/₈₁+⁹⁰/₅₆

Add Fractions Calculator