Anthony got a job babysitting. Each hour he works he will be paid 8.00 as a bonus he will earn additional 1.50 per hour for each child he watches. If his total hourly rate is 12.50 how many children does he watch

Let's say Anthony is watching x children.

The base pay for each hour is 8.00.
For x children, he earns an additional 1.50 per hour.
So, the total earning per hour for each child is 8.00 + 1.50 = 9.50.
Since his total hourly rate is 12.50, the number of children he watches is (12.50 - 8.00) / 1.50 = 4.33.
Since Anthony cannot watch a fraction of a child, the number of children he watches is 4. Answer: \boxed{4}.