Hey!!
If you have 2 dice then you can end up with 4 two times.
1 + 3 or 3 + 1
2 + 2 or 2 + 2
oooorrrrrrr
you can end up rolling 4 twice because a number 4 is printed on each die once.
Therefor your total number of 4 you can roll is four times.
Hope this helps!!