OK, let's crack this. We're given 605 and our task is to multiply it by 8. Essentially, we'll be adding 605 to itself 8 times.
Step 1: 0 + 605 = 605
Step 2: 605 + 605 = 1210
Step 3: 1210 + 605 = 1815
Step 4: 1815 + 605 = 2420
Step 5: 2420 + 605 = 3025
Step 6: 3025 + 605 = 3630
Step 7: 3630 + 605 = 4235
Step 8: 4235 + 605 = 4840

So, 605*8 = 4840