OK, let's crack this. We're given 436 and our task is to multiply it by 3. Essentially, we'll be adding 436 to itself 3 times.
Step 1: 0 + 436 = 436
Step 2: 436 + 436 = 872
Step 3: 872 + 436 = 1308

So, 436*3 = 1308