Let's roll up our sleeves and solve this. We have 849 and we're going to multiply it by 5, essentially adding 849 to itself 5 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

So, 849*5 = 4245