Download Variables and Expressions

Assignment #______ Variables and Expressions
Name _____________________________
Standards: AF 1.1 Use variables and appropriate
operations to write expressions.
AF 1.4 Use algebraic terms:
variable, expression
Pre-Algebra, Period _______
Date ______________________________
Example:
15 • 15 + 14 is a NUMERICAL EXPRESSION because um… it only has NUMBERS.
15 + a – 10 is a VARIABLE EXPRESSION because it has a VARIABLE. “A” is the variable.
Identify each expression as a NUMERICAL or a VARIABLE EXPRESSION. For a variable
expression, name the variable.
1. 12 • 12 ________________________
2. 8 + 8 + 9 + 9 ________________________
Variable ______
Variable ______
3. h + 15 – 7 ________________________
4. 50x ________________________
Variable ______
Variable ______
Write the phrase as an algebraic expression. Let x represent the variable.
Verbal Phrase
Example: The difference of a number and 21
5.
A number more than nineteen
Algebraic Expression
x – 21________
___________________
6. The sum of a number and 11
___________________
7. A number divided by 3
___________________
8. 32 times a number
___________________
9. The square of a number, increased by 3
___________________
10. A number subtracted by 10
___________________
Write an expression for each quantity.
11. The number of days in four weeks
12. The number of days in w weeks.
_________________________________
_____________________________
A hot air balloon is at an altitude of m meters.
Write a word phrase for each expression.
This may require some creativity on your part.
Make up a situation.
Algebraic Expression
Word Phrase
13. m + 34
_________________________________________________
14. m – 2000
_________________________________________________
15. 3m
_________________________________________________
16. Which algebraic expression represents the verbal phrase 2 minus the product of 6 and x?
A 2 – 6x
B 6x – 2
C 2–
6
x
D 2x – 6
17. A store sells CDs for $13 each. Write an expression for the store’s total sales when x CDs are sold.

18. You buy a PS3 for $300 and games for $60 each. Write an algebraic expression for the cost to buy
the PS3 and x games.
19. Using the information from question #18, how much would you spend (total cost, including the PS3)
if you were to purchase 2 games?
20. How much would you spend if you purchased 7 games?