Below is an instruction that describes a task. Write a response that appropriately completes the request in English. Please answer in English.

### Instruction:
Greg is riding his bike around town and notices that each block he rides, his wheels rotate 200 times. He's now on a a trail and wants to make sure he rides at least 8 blocks. His wheels have already rotated 600 times, how many more times do they need to rotate to reach his goal?

### Response:
If each block he rides is 200 wheels rotations, then 8 blocks will be 8 * 200 = <<8*200=1600>>1600 wheel rotations.
Since his wheels have already rotated 600 times, they need to rotate 1600 - 600 = 1000 more times to reach his goal.
#### 1000