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Exact Numbers

Exact Numbers

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Exact Numbers

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  1. Exact Numbers • Obtained when you count objects 2 soccer balls 1 watch 4 pizzas • Obtained from a defined conversion factors 1 foot = 12 inches 1 meters = 100 cm • Not obtained with measuring tools • Do not limit the # of sig figs in the answer.

  2. Learning Check A. Exact numbers are 1. measured values 2. count values 3. defined conversion factors B. Measured numbers are obtained by (from) 1. using a measuring tool 2. counting 3. defined conversion factors

  3. Learning Check Classify each of the following as an exact (1) or a measured (2) number. A.___Gold melts at 1064°C B.___1 yard = 3 feet C.___A red blood cell with diameter 6 x 10-4 cm D.___There were 6 hats on the shelf E.___A can of soda contains 355 mL of soda 2 1 2 1 2