Let's get this math done. We have 913 and we're going to multiply it by 7. This is the same as taking 913 and adding it to itself 7 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

So, 913*7 = 6391