Answers

Add 25/20 and 42/81

1^st number: 1 5/20, 2^nd number: 42/81

25/20 + 42/81 is 191/108.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 20 and 81 is 1620
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1620
2. For the 1st fraction, since 20 × 81 = 1620,
   25/20 = 25 × 81/20 × 81 = 2025/1620
3. Likewise, for the 2nd fraction, since 81 × 20 = 1620,
   42/81 = 42 × 20/81 × 20 = 840/1620
4. Add the two like fractions:
   2025/1620 + 840/1620 = 2025 + 840/1620 = 2865/1620
5. 2865/1620 simplified gives 191/108
6. So, 25/20 + 42/81 = 191/108
   In mixed form: 183/108

MathStep (Works offline)

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

Related: ⁵⁰/₂₀+⁴²/₈₁ ²⁵/₂₀+⁸⁴/₈₁ ²⁵/₄₀+⁴²/₈₁ ⁷⁵/₂₀+⁴²/₈₁ ²⁵/₆₀+⁴²/₈₁

Add Fractions Calculator