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Middle School Math
Mathématiques
Middle School Math
Nombres décimaux

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 Name _____________________________ Date ___________________
Nombres décimaux
Complète.

 1 Many small algae are approximately spherical in shape. Professor Glump has made it his life's work to catalog and compare all the spherical algae in the world. He is studying two newly discovered species that differ in diameter by a 1.4 x 10-5m. If the larger of the two species has an average diameter of0.00073m, what is the average diameter of the smaller species? Express your answer using scientific notation.
 2 With the help of Mr. Bloop, some middle school students measured the growth rate of a fungus. An old fashioned (but still useful) apparatus called a race tube was used. A small piece of the fungus was placed at one end of a long tube that had a layer of growth medium filling it about half way. Then the distance the fungus grew down the tube was measured each day. At the end of three weeks the fungus had advanced32cm along the tube. What was the average speed of advance of the fungus in m/s? Express your answer using scientific notation.
 3 If a micromachine can travel down a microtubule at a rate of 2.2 x 10-3mm per minute, how many meters could it travel in4hours? Express your answer using scientific notation.
 4 Katherine is grinding a part for a spacecraft to be sent on a mission to mars. The part must be very precise. Right now it is oversized by 2.4 x 10-3inches. If she makes two passes with the grinding machine and takes off half the required amount each time, how much will be ground off on each pass?
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 6 If the area of a square that has side lengths of 7.3 x 102cm is decreased by23%, what is the new side length? Express your answer using scientific notation.

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