Let's get this math done. We have 668 and we're going to multiply it by 3. This is the same as taking 668 and adding it to itself 3 times.
Step 1: 0 + 668 = 668
Step 2: 668 + 668 = 1336
Step 3: 1336 + 668 = 2004

So, 668*3 = 2004