Let's get this math done. We have 102 and we're going to multiply it by 10. This is the same as taking 102 and adding it to itself 10 times.
Step 1: 0 + 102 = 102
Step 2: 102 + 102 = 204
Step 3: 204 + 102 = 306
Step 4: 306 + 102 = 408
Step 5: 408 + 102 = 510
Step 6: 510 + 102 = 612
Step 7: 612 + 102 = 714
Step 8: 714 + 102 = 816
Step 9: 816 + 102 = 918
Step 10: 918 + 102 = 1020

So, 102*10 = 1020