Let's get this math done. We have 849 and we're going to multiply it by 9. This is the same as taking 849 and adding it to itself 9 times.
Step 1: 0 + 849 = 849
Step 2: 849 + 849 = 1698
Step 3: 1698 + 849 = 2547
Step 4: 2547 + 849 = 3396
Step 5: 3396 + 849 = 4245
Step 6: 4245 + 849 = 5094
Step 7: 5094 + 849 = 5943
Step 8: 5943 + 849 = 6792
Step 9: 6792 + 849 = 7641

So, 849*9 = 7641