OK, let's work through this together. We're starting with 726 and we're going to multiply it by 3, which means we add 726 to itself 3 times.
Step 1: 0 + 726 = 726
Step 2: 726 + 726 = 1452
Step 3: 1452 + 726 = 2178

So, 726*3 = 2178