Explain how to find 40×50 using mental math

Think about 40 over 50 and a line separating the answer from the problem like this:

                 40
              x 50
             
                200         0*0=0 5*4= 20 so just put the zero back on the answer and you get 200.

the answer goes under the dotted line

The answer is c cause I took the quiz

Step-by-step explanation: