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Multiplying and Dividing by 10,100,and 1,000(Contd) September 17,2013 Common Core Standard: Understand place value pattern can help you multiply and divide by powers of 10.

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Number Talk

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Problem X ____ = X 100 =_____________ 8,231 ÷10,000= ___________

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Problem Solving A coral poly is a tubular saclike animal with a central mouth surrounded by a ring of tentacles. The size of polyp varies. If each polyp is 0.12 inch in diameter, how many polyps would fit in a row 12 inches long? If each polyp is 0.12 inch in diameter, how many polyps would fit in an area of coral reef that is 1 foot long by 1 foot wide?

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Problem Solving Suppose that one bacterial cell divides every 30 minutes to make 2 cells. Which expression will find how many cells there will be after 3 hours? A. 1 X 2 X 2 X 2 X 2 X 2 B. 2 X 30 C 2 X 2 X 30 D. 1 X2 X 2 X 2 X2 X 2 X 2

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