january 6, 2009math 201 review:converting fractions to decimals in a word…divide! converting...
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January 6, 2009 Math 201
REVIEW: Converting fractions to decimals
In a word…DIVIDE!
Converting decimals to percents
In two words…Place Value!
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Objective: Students will be able to convert fractions to percents
Aim: In what ways can division and place value help us to convert fractions to percents?
NYS Mathematics Standards: 6.N.11, 6.N.21
Prior Knowledge: Convert 2/5 to a decimal
Convert .4 to a percent
January 6-7, 2010 Math 201
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Mini-lesson:
To convert a fraction to a percent:
First convert the fraction to a decimal, then convert the decimal to a percent
FRACTION DECIMAL PERCENT
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Example:
Convert the fraction 9/20 to a percent
1. Change 9/20 to a decimal, by dividing 20 into 9
2. Change the decimal to a percent, by moving the decimal point two places to the right.
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Example:
Convert the fraction 6/25 to a percent
1. Change 6/25 to a decimal, by dividing 25 into 6
2. Change the decimal to a percent, by moving the decimal point two places to the right.
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Example:
Convert the fraction 3/8 to a percent
1. Change 3/8 to a decimal, by dividing 8 into 3
2. Change the decimal to a percent, by moving the decimal point two places to the right.
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If we wanted to convert a percent to a fraction, how do you think we could do that? What steps could we follow?
Example: 75%
Question:
What about a percent to a decimal?
Example: 65%
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What about a decimal to a fraction?
Example: 0.125 (Think: place value)
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Independent Practice: Worksheet handout, problems 1,4 and 7
Homework: Finish problems 2,3,5,6,8 and 9
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