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===How do we know the student understands?===
 
===How do we know the student understands?===
A student understands the basic use of the addition and subtraction of money if the percent of times they over pay initially, followed by correct payment is higher than 70%.
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* Since this activity only involves money (not raw numbers), and money independent of any actual real-world currency all results here allow us to conclude that the user understands the mathematical operation within the scope of currentcy
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