Notice that:
6 + 5 = 11 and 5 + 6 = 11
7 + 2 = 9 and 2 + 7 = 9
8 + 13 = 21 and 13 + 8 = 21
28 + 59 = 87 and 59 + 28 = 87
Adding can be done in any order.
You always get the same answer.
*****WARNING*****
Subtracting is different.
28 - 19 = 9 but 19 - 28 = -9
They are not the same.
Subtracting cannot be done in any order.
Does that make sense?
Let's try some questions now.