Answers

Add 42/21 and 28/27

1^st number: 2 0/21, 2^nd number: 1 1/27

42/21 + 28/27 is 82/27.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 27 is 189
   
   Next, find the equivalent fraction of both fractional numbers with denominator 189
2. For the 1st fraction, since 21 × 9 = 189,
   42/21 = 42 × 9/21 × 9 = 378/189
3. Likewise, for the 2nd fraction, since 27 × 7 = 189,
   28/27 = 28 × 7/27 × 7 = 196/189
4. Add the two like fractions:
   378/189 + 196/189 = 378 + 196/189 = 574/189
5. 574/189 simplified gives 82/27
6. So, 42/21 + 28/27 = 82/27
   In mixed form: 31/27

MathStep (Works offline)

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

Related: ⁸⁴/₂₁+²⁸/₂₇ ⁴²/₂₁+⁵⁶/₂₇ ⁴²/₂₁+²⁸/₅₄ ⁴²/₂₁+⁸⁴/₂₇ ⁴²/₆₃+²⁸/₂₇ ⁴²/₂₁+²⁸/₈₁

Add Fractions Calculator