Sure thing, let's get straight to it. We start with 666 and we're going to multiply it by 10, which means adding 666 to itself 10 times.
Step 1: 0 + 666 = 666
Step 2: 666 + 666 = 1332
Step 3: 1332 + 666 = 1998
Step 4: 1998 + 666 = 2664
Step 5: 2664 + 666 = 3330
Step 6: 3330 + 666 = 3996
Step 7: 3996 + 666 = 4662
Step 8: 4662 + 666 = 5328
Step 9: 5328 + 666 = 5994
Step 10: 5994 + 666 = 6660

So, 666*10 = 6660