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Home > MC2 > Chapter 10 > Lesson 10.1.2 > Problem 10-21

10-21.

Rewrite each decimal as a fraction or fraction as a decimal.  

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  • Notice the place value of the decimal point.

    What can you divide by to get ?

    When you divide any number by etc., the decimal point moves to the left according to the number of zeros in the divisor.

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  • Use the same method as in part (a).

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  • Notice that 1.21 has a decimal point two decimal places to the left. Two decimal places refers to the hundredths place.

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  • You can conclude from parts (a) and (c) that dividing by a number consisting of multiple zeros moves the decimal left a number of times equal to the amount of zeros.

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  • Notice that the number has two zeros.

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  • How many zeros does the denominator have? How many times and in which direction should the decimal point move?