Answers

Add 25/27 and 42/21

1^st number: 25/27, 2^nd number: 2 0/21

25/27 + 42/21 is 79/27.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 27 and 21 is 189
   
   Next, find the equivalent fraction of both fractional numbers with denominator 189
2. For the 1st fraction, since 27 × 7 = 189,
   25/27 = 25 × 7/27 × 7 = 175/189
3. Likewise, for the 2nd fraction, since 21 × 9 = 189,
   42/21 = 42 × 9/21 × 9 = 378/189
4. Add the two like fractions:
   175/189 + 378/189 = 175 + 378/189 = 553/189
5. 553/189 simplified gives 79/27
6. So, 25/27 + 42/21 = 79/27
   In mixed form: 225/27

MathStep (Works offline)

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

Related: ⁵⁰/₂₇+⁴²/₂₁ ²⁵/₂₇+⁸⁴/₂₁ ²⁵/₅₄+⁴²/₂₁ ⁷⁵/₂₇+⁴²/₂₁ ²⁵/₈₁+⁴²/₂₁ ²⁵/₂₇+⁴²/₆₃

Add Fractions Calculator