#### Mental arithmetic

Students perform simple mental arithmetic: addition, subtraction, multiplication and division.

Students estimate arithmetic calculations.### Questions

If a disease strikes 3,000 people in the U.S. each year, about what percentage of the population is that? Answer!

For 2013, the National Endowment for the Humanities requested a budget of about $150 million. What is the cost per capita in the U.S.? Answer!

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