OK, let's crack this. We're given 612 and our task is to multiply it by 4. Essentially, we'll be adding 612 to itself 4 times.
Step 1: 0 + 612 = 612
Step 2: 612 + 612 = 1224
Step 3: 1224 + 612 = 1836
Step 4: 1836 + 612 = 2448

So, 612*4 = 2448