OK, let's work through this together. We're starting with 913 and we're going to multiply it by 18, which means we add 913 to itself 18 times.
Step 1: 0 + 913 = 913
Step 2: 913 + 913 = 1826
Step 3: 1826 + 913 = 2739
Step 4: 2739 + 913 = 3652
Step 5: 3652 + 913 = 4565
Step 6: 4565 + 913 = 5478
Step 7: 5478 + 913 = 6391
Step 8: 6391 + 913 = 7304
Step 9: 7304 + 913 = 8217
Step 10: 8217 + 913 = 9130
Step 11: 9130 + 913 = 10043
Step 12: 10043 + 913 = 10956
Step 13: 10956 + 913 = 11869
Step 14: 11869 + 913 = 12782
Step 15: 12782 + 913 = 13695
Step 16: 13695 + 913 = 14608
Step 17: 14608 + 913 = 15521
Step 18: 15521 + 913 = 16434

So, 913*18 = 16434