Have been stuck on this problem for forever and still don't understand how to do it.

Most of the people don’t make the sense of taking it

That is right sorry i was gonna answer but i already saw his

This law is sometimes called the grouping property. as you can see, regardless of how the numbers are grouped, the answer is still 13. the associative law of multiplication is similar to the same law for addition. it says that no matter how you group numbers you are multiplying together, you will get the same answer.