Sure thing! We've got 660 and we're gonna multiply it by 5. That's the same as adding 660 to itself 5 times.
Step 1: 0 + 660 = 660
Step 2: 660 + 660 = 1320
Step 3: 1320 + 660 = 1980
Step 4: 1980 + 660 = 2640
Step 5: 2640 + 660 = 3300

So, 660*5 = 3300