This means that you would have to bet $200 on the Packers in order to win $100 back. Anytime you see odds with a minus in front of it, take the number and that is what you would need to bet in order to win $100 in profit. So, a -450 number would mean that you would have to bet $450 in order to win $100 in profit back.

If it's positive just add 1 to (odd divided by 100) Example: 250 = 1+ (250/100)=3.50 If it's negative subtract (100/odd) to from 1 Example: -250 = 1- (100/-250)=1.40