He competed in the UIL State Number Sense Competition.
Of 2000 participants he placed 19th!
Competitors in Number Sense have 10 minutes to complete 80 questions. They have to figure the answers to complex math questions . . . in their heads! They cannot use scratch paper to figure the answer.
On the UIL Academic Contests website, you can see an overview of Number Sense.
Click here for a sample test.