OK, let's crack this. We're given 913 and our task is to multiply it by 4. Essentially, we'll be adding 913 to itself 4 times.
Step 1: 0 + 913 = 913
Step 2: 913 + 913 = 1826
Step 3: 1826 + 913 = 2739
Step 4: 2739 + 913 = 3652

So, 913*4 = 3652