Answers

Add 3/8 and 81/40

1^st number: 3/8, 2^nd number: 2 1/40

3/8 + 81/40 is 12/5.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 8 and 40 is 40
   
   Next, find the equivalent fraction of both fractional numbers with denominator 40
2. For the 1st fraction, since 8 × 5 = 40,
   3/8 = 3 × 5/8 × 5 = 15/40
3. Likewise, for the 2nd fraction, since 40 × 1 = 40,
   81/40 = 81 × 1/40 × 1 = 81/40
4. Add the two like fractions:
   15/40 + 81/40 = 15 + 81/40 = 96/40
5. 96/40 simplified gives 12/5
6. So, 3/8 + 81/40 = 12/5
   In mixed form: 22/5

MathStep (Works offline)

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

Related: ⁶/₈+⁸¹/₄₀ ³/₁₆+⁸¹/₄₀ ³/₈+⁸¹/₈₀ ⁹/₈+⁸¹/₄₀ ³/₂₄+⁸¹/₄₀ ¹⁵/₈+⁸¹/₄₀ ³/₄₀+⁸¹/₄₀ ²¹/₈+⁸¹/₄₀ ³/₅₆+⁸¹/₄₀

Add Fractions Calculator