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Joe, a fifth grader, asked why the union of any two sets (such as two chairs and three umbrellas meaning five, or six girls and tour boys meaning ten) means addition Joe says that
he always gets the answer easily. How would you explain to Joe why his approach does or does not work?
Choose the correct answer below. Use the Show Work learning aid to provide related calculations and additional reasoning to support your answer
OA. His approach does work
B. His approach does not work