OK, let's crack this. We're given 817 and our task is to multiply it by 7. Essentially, we'll be adding 817 to itself 7 times.
Step 1: 0 + 817 = 817
Step 2: 817 + 817 = 1634
Step 3: 1634 + 817 = 2451
Step 4: 2451 + 817 = 3268
Step 5: 3268 + 817 = 4085
Step 6: 4085 + 817 = 4902
Step 7: 4902 + 817 = 5719

So, 817*7 = 5719