E
E
|Constant |Variable |
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|Similarities: |Similarities |
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|Differences |Differences |
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|These are constants. |These are variables. |
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|Numerical Expression |Algebraic Expression |
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|Similarities: |Similarities |
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|Differences |Differences |
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|These are numerical expressions. |These are algebraic expression. |
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Ex: Re-write the word problem into an algebraic expression.
1. Roberto is 4 years older than Emily, who is y years old. Write an expression for Roberto’s age
2. John types 62 words per minute. Write an expression for the number of words he types in m minutes.
3. Joey earns $5 for each car he washes. Write an expression for the number of cars Joey must wash to earn d dollars.
You will need to be able to plug numbers into variables
• “equal sign” (in terms of variables)-
Ex:
Ex: Evaluate each expression for a = 4, b =7, c = 2, p = 8, and m = 4
1. [pic] 2. [pic]
3. [pic] 4. [pic]
5.
6. Approximately eighty-five 20-ounce plastic bottles must be recycled to produce the fiberfill for a sleeping bag. Write an expression for the number of bottles needed to make s sleeping bags.
How many bottles will it take to make:
a. 20 sleeping bags b. 50 sleeping bags
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Questions?/Don’t Forgets
Main Ideas/Summary
8/29-8/30
Variables, Translating, & Evaluating Expressions
• VARIABLE
• CONSTANT
• NUMERICAL EXPRESSION
• ALGEBRAIC EXPRESSION
• EVALUATE
You must be able to translate these mathematical symbols into words
|[pic] |- |
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|[pic] |[pic] |
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Ex: Give two ways to write the algebraic expression in words.
1. 9 + r 2. q – 3 3. 7m
4. j ( 6 5. [pic] 6. [pic]
You must also be able to translate words back into mathematical symbols
|Add |Subtract |
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| | |
|Multiply |Divide |
| | |
| | |
Ex: Re-write the word problem into an algebraic expression.
1. Roberto is 4 years older than Emily, who is y years old. Write an expression for Roberto’s age
2. John types 62 words per minute. Write an expression for the number of words he types in m minutes.
3. Joey earns $5 for each car he washes. Write an expression for the number of cars Joey must wash to earn d dollars.
You will need to be able to plug numbers into variables
• “equal sign” (in terms of variables)-
Ex:
Ex: Evaluate each expression for a = 4, b =7, c = 2, p = 8, and m = 4
1. [pic] 2. [pic]
3. [pic] 4. [pic]
5.
6. Approximately eighty-five 20-ounce plastic bottles must be recycled to produce the fiberfill for a sleeping bag. Write an expression for the number of bottles needed to make s sleeping bags.
How many bottles will it take to make:
a. 20 sleeping bags b. 50 sleeping bags
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