In order to add, the denominators must be the same. So find the LCD(least common denominator).
Both denominators go into 6. So:
5/6 = 5/6
2/3 = ?/6
3 multiplied by 2 equals 6, so multiply 2(the numerator) by 2:
2/3 = 4/6
Now add 5/6 + 4/6 = 10/6
Change into a mixed number:
6 goes into 10 ONE time with 4 left over so:
1 4/6
simplified is: \[1\frac{ 2 }{3 }\]