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

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

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

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?

Let’s record what we notice…

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.

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?

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.

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

Solving Number Stories Involving Discounts

SRB 246

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