Determining the Half-way Mark

Problem:

45 & 53 = ?

Solution
Step 1:           Write out the numbers that come in between.

Solution

Step 1

Complete:     45 46 47 48 49 50 51 52 53

 Solution
Step 2:           Find what number is in the middle. 

Solution

Step 2

Complete:     45 46 47 48 49 50 51 52 53

         45 & 53 = 49