Answers

Add 75/21 and 18/42

1^st number: 3 12/21, 2^nd number: 18/42

75/21 + 18/42 is 4/1.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 42 is 42
   
   Next, find the equivalent fraction of both fractional numbers with denominator 42
2. For the 1st fraction, since 21 × 2 = 42,
   75/21 = 75 × 2/21 × 2 = 150/42
3. Likewise, for the 2nd fraction, since 42 × 1 = 42,
   18/42 = 18 × 1/42 × 1 = 18/42
4. Add the two like fractions:
   150/42 + 18/42 = 150 + 18/42 = 168/42
5. 168/42 simplified gives 4/1
6. So, 75/21 + 18/42 = 4/1

MathStep (Works offline)

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

Related: ⁷⁵/₂₁+³⁶/₄₂ ⁷⁵/₄₂+¹⁸/₄₂ ⁷⁵/₂₁+¹⁸/₈₄ ⁷⁵/₂₁+⁵⁴/₄₂ ⁷⁵/₆₃+¹⁸/₄₂ ⁷⁵/₂₁+⁹⁰/₄₂

Add Fractions Calculator