OK, let's crack this. We're given 823 and our task is to multiply it by 3. Essentially, we'll be adding 823 to itself 3 times.
Step 1: 0 + 823 = 823
Step 2: 823 + 823 = 1646
Step 3: 1646 + 823 = 2469

So, 823*3 = 2469