Sure thing! We've got 669 and we're gonna multiply it by 4. That's the same as adding 669 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