I'm assuming that you want to know what we get when we multiply 15 by 3.
15

3 =
45.
If you are confused, then read on. :)
The

symbol means you add 15 exactly 3 times. 15+15+15=
45.
Let's take

for example.

is when you add 3 for a total of 2 times. 3 + 3 = 6. You can also say that

is when you add 2 for a total of 3 times. 2 + 2 + 2 = 6.
So 15

3 =
45.
15 + 15 + 15 =
45and
3 + 3 + 3 + 3 + 3 + 3 + 3 + 3 + 3 + 3 + 3 + 3 + 3 +3 +3 =
45.
So the answer is
45. :)