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I'm having my nephew over for a week while his parents are on vacation. I reckon it's my only chance to turn him into a math genius because his parents are more of the literature types and I don't have him over often.

I already have an array of non-math related, age-appropriate toys and I don't have high expectations, still I'd like to do something.

I already started trying to teach him to count with his fingers on the occasions where I babysit him. What else can I do, and what math related toys should I buy?