Let's get this math done. We have 512 and we're going to multiply it by 8. This is the same as taking 512 and adding it to itself 8 times.
Step 1: 0 + 512 = 512
Step 2: 512 + 512 = 1024
Step 3: 1024 + 512 = 1536
Step 4: 1536 + 512 = 2048
Step 5: 2048 + 512 = 2560
Step 6: 2560 + 512 = 3072
Step 7: 3072 + 512 = 3584
Step 8: 3584 + 512 = 4096

So, 512*8 = 4096