Kenny's standardized test scores from the spring arrived in the mail yesterday from his school. Everything was average or above but he struggled the most at computation with whole numbers.

I don't know whether the segment was timed but he's probably slow because he still counts on his fingers. With numbers greater than twenty, you really can't afford to count on your fingers.

I think his teacher was trying to get the class away from the counting-on-their-fingers method - teach something in one grade and unlearn/learn something else in another! - but, well, you can see the problem.