Let's get this math done. We have 921 and we're going to multiply it by 5. This is the same as taking 921 and adding it to itself 5 times.
Step 1: 0 + 921 = 921
Step 2: 921 + 921 = 1842
Step 3: 1842 + 921 = 2763
Step 4: 2763 + 921 = 3684
Step 5: 3684 + 921 = 4605

So, 921*5 = 4605