OK, let's crack this. We're given 663 and our task is to multiply it by 4. Essentially, we'll be adding 663 to itself 4 times.
Step 1: 0 + 663 = 663
Step 2: 663 + 663 = 1326
Step 3: 1326 + 663 = 1989
Step 4: 1989 + 663 = 2652

So, 663*4 = 2652