OK, let's crack this. We're given 452 and our task is to multiply it by 4. Essentially, we'll be adding 452 to itself 4 times.
Step 1: 0 + 452 = 452
Step 2: 452 + 452 = 904
Step 3: 904 + 452 = 1356
Step 4: 1356 + 452 = 1808

So, 452*4 = 1808