Middle School

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------------------------------------------------ You have a 10 kg bag of sand. The mass of a grain of sand is about [tex]10^{-3}[/tex] grams. About how many grains of sand are in the bag?

Answer :

10 kg* (1000 g/ 1 kg)* (1 grain of sand/ 10^(-3) g)= 10^7 grains of sand.
(Note that the units cancel out so you get the answer)

The final answer is 10^7 grains of sand.

Hope this helps~

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