Let's get this math done. We have 756 and we're going to multiply it by 18. This is the same as taking 756 and adding it to itself 18 times.
Step 1: 0 + 756 = 756
Step 2: 756 + 756 = 1512
Step 3: 1512 + 756 = 2268
Step 4: 2268 + 756 = 3024
Step 5: 3024 + 756 = 3780
Step 6: 3780 + 756 = 4536
Step 7: 4536 + 756 = 5292
Step 8: 5292 + 756 = 6048
Step 9: 6048 + 756 = 6804
Step 10: 6804 + 756 = 7560
Step 11: 7560 + 756 = 8316
Step 12: 8316 + 756 = 9072
Step 13: 9072 + 756 = 9828
Step 14: 9828 + 756 = 10584
Step 15: 10584 + 756 = 11340
Step 16: 11340 + 756 = 12096
Step 17: 12096 + 756 = 12852
Step 18: 12852 + 756 = 13608

So, 756*18 = 13608