OK, let's work through this together. We're starting with 43 and we're going to multiply it by 4, which means we add 43 to itself 4 times.
Step 1: 0 + 43 = 43
Step 2: 43 + 43 = 86
Step 3: 86 + 43 = 129
Step 4: 129 + 43 = 172

So, 43*4 = 172