In how many ways can you roll either a sum of 4 or a sum of 11 with a pair of dice?

(I don't understand the mathematical way)

For 4:

You can do-

- 1 and 3

- 2 and 2

For 11 you can do-

- 1 and 10

- 2 and 9

- 3 and 8

- 4 and 7

- 5 and 6

So you can roll 2 different ways to get a sum of 4, and 5 different ways to get a sum of 11

What numbers add to 4?

2,2

2,2 (other side)

1,3

3,1

what numbers add to 11?

5,6

6,5

4+2=6

6 ways I would say