what would I put in the blanks to get 20? I have +,-,x,÷
Rather than giving you the answer, I am going to give you two hints, and see if you can figure it out.
First, 20 is bigger than 4,2, and 8 added together, so there is going to be some multiplication involved.
Second, remember the order of operations: Parentheses, Exponents, Multiplication and Division, then Addition and Subtraction. For example: 12 - 2 x 5 = 2 because you have to do the multiplication before the subtraction.
Hope this helps!
Assuming all operators are acceptable including powers, one such possibility is:
42 -22 +8 = 20
16-4+8 = 20
This assumes that powers can be added. I can find no way to 20 with just those operators you have listed.