What number make the sentence true 12*(36+17)=12*36+ *17

12*(36+17) is a factorized form. To develop it, you multiply the outside number by each number inside the parenthesis and you add them to get the result.
So 12*(36+17) = 12*36 + 12*17.

So the number 12 makes the sentence true.

Hope this Helps! :)