OK, let's crack this. We're given 402 and our task is to multiply it by 3. Essentially, we'll be adding 402 to itself 3 times.
Step 1: 0 + 402 = 402
Step 2: 402 + 402 = 804
Step 3: 804 + 402 = 1206

So, 402*3 = 1206