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Mathematics 13 Online
OpenStudy (anonymous):

At the convenience store 7 pencils cost $1.47. How much does it cost to buy 70 pencils?

OpenStudy (anonymous):

14.7$

OpenStudy (mathstudent55):

Here are two ways of doing this problem. 1) Since 70 is 10 times 7, the price of 70 pencils is 10 times the price of 7 pencils. Multiply $1.47 by 10. 2) Since 7 pencils cost $1.47, you can find the price of 1 pencil by dividing $1.47/7. Then to find the price of 70 pencils, multiply the price of one pencil by 70.

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