Let's get this math done. We have 723 and we're going to multiply it by 3. This is the same as taking 723 and adding it to itself 3 times.
Step 1: 0 + 723 = 723
Step 2: 723 + 723 = 1446
Step 3: 1446 + 723 = 2169

So, 723*3 = 2169