OK, let's work through this together. We're starting with 72 and we're going to multiply it by 4, which means we add 72 to itself 4 times.
Step 1: 0 + 72 = 72
Step 2: 72 + 72 = 144
Step 3: 144 + 72 = 216
Step 4: 216 + 72 = 288

So, 72*4 = 288