I think it would be pretty safe to say he invented the Venn Diagram
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It's a guide in solving percentage problems.
1. Mathletics 2. google
he did math problems
He created the "Venn diagram" which is used when dealing with "sets" in mathematics.
There are many different types of cool math games that exist for kids and young children. There are games that are just solving math problems and there are games that incorporate mathematical concepts.