OK, let's crack this. We're given 490 and our task is to multiply it by 8. Essentially, we'll be adding 490 to itself 8 times.
Step 1: 0 + 490 = 490
Step 2: 490 + 490 = 980
Step 3: 980 + 490 = 1470
Step 4: 1470 + 490 = 1960
Step 5: 1960 + 490 = 2450
Step 6: 2450 + 490 = 2940
Step 7: 2940 + 490 = 3430
Step 8: 3430 + 490 = 3920

So, 490*8 = 3920