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Introduction
Read the Headline Story to the students. If students have trouble coming up with responses, you might prompt them by giving an example of how $5 in change could result from a purchase.
Headline Story
Pete sells birthday cards for $3. One day he notices that he keeps running out of $5 bills because most of his customers are receiving exactly $5 in change for their purchases. No customer bought more than 10 cards.
Possible student responses
- A customer who bought one card would have to pay $8 to receive $5 in change. That wouldn’t make sense because the customer could have paid $3 exactly.
- Two cards would cost $6. To receive $5 in change, the customer would have to pay $11. This is a reasonable amount to give a cashier because it would provide the convenience of a $5 in change instead of four $1 bills.
- Customers who bought three or four birthday cards would have to give Pete $14 or $17 to receive $5 in change, but those amounts don’t make sense for the same reason that paying with $8 doesn’t make sense.