Answer: 3⁷/₁₂
Step-by-step explanation:
Numerator- number on top of fraction
Denominator- number on bottom of fraction 
First find a common denominator. A number that both denominators can go into. In this case we'll use 12. Because both of the denominators, 6 and 4, fit into 12. 
6 goes into 12 twice. And 4 goes into 12 three times. 
To convert to a common denominator, multiply both the numerator and the denominator by the same number. Do not multiply the whole number. 
So because 6 goes into 12 twice, we multiply by 2. 
⁵/₆ x 2 = ¹⁰/₁₂
And because 4 goes into 12 three times, we multiply by 3.
2³/₄ × 3 = 2⁹/₁₂
Okay so now that both numbers have a common denominator, we can add.
¹⁰/₁₂ + 2⁹/₁₂ = 2 ¹⁹/₁₂ 
Simplified as 3 ⁷/₁₂