Let's get this math done. We have 669 and we're going to multiply it by 4. This is the same as taking 669 and adding it to itself 4 times.
Step 1: 0 + 669 = 669
Step 2: 669 + 669 = 1338
Step 3: 1338 + 669 = 2007
Step 4: 2007 + 669 = 2676

So, 669*4 = 2676