1. Make the denominators (bottoms) equal:

2/3 + 4/6

The denominator '3' goes into the denominator '6' 2 times, so multiply the 2/3 by 2/2 which gives you 4/6 (2 times 2=4, 2 times 3=6). The result is you have:

4/6 + 4/6

2. Now that the denominators are equal, you can add the numerators (tops), so 4+4=8. The result is:

8/6

or 1 and 1/3

or 4/3

I always liked to check my work using a calculator. If you have one, then you can check to see that 8 divided by 6 gives the same answer as 4 divided by 3. You can also use the calculator to actually check 2/3 + 4/6 by entering:

2 divided by 3 (which = .66666667)

4 divided by 6 (which = .66666667) they're the same because 2/3=4/6!

Add them together on the calculator and you get 1.33333333 which is the same as 4/3!