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Published byDorthy Alexis Ward Modified over 7 years ago

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Lesson 9.3 and 9.4: Using a Calculator with fractions, decimals, and percents

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Mental Math For each fraction, write the equivalent decimal and percent on your white board. Example: You would write: ____ and ____

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Math Message Use your calculator to divide the numerators of the following fractions by the denominator: For example, 1divide by 2 = ____ Record your findings in your Math Notebook. What do you notice?

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Let’s record what we notice…

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We are going to rename each fraction on MJ pages 342 and 343 as a decimal using division. Write each digit shown on the calculator up to six digits following the decimal point. Let’s try 2/3. Press 2 on your calculator, the division button, and 3. What is your decimal? Write up to 6 digits after the decimal point.

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Patterns we noticed… For example: I see that some of the fractions have short decimal names with 1, 2, or 3 digits after the decimal point and no other digits behind that. What do these fractions with short decimal names have in common?

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Experiment with the % key on your calculator to find a way to rename ¼ as a percent. Write your method in your Math Notebook. One way: You do NOT need to use the % key on your calculator to rename a fraction as a percent.

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Divide the numerator by the denominator Once you have the decimal, just multiply the decimal by 100.

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Solving Number Stories Involving Discounts

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SRB 246

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