NAME
DATE
PERIOD
Lesson 4 Reteach
Algebra: Write
Expressions
S t e p s for writing a n a l g e b r a i c e x p r e s s i o n :
S t e p 1 : Describe the situation. Use only the most important words.
S t e p 2: Define a variable by choosing a variable to represent the unknown quantity.
S t e p 3: Translate your verbal model into an algebraic expression.
Example 1
Write ten cans more than Vanessa collected
ten cans more than Vanessa collected
Step 1: Words
Step 2: V a r i a b l e
a s a n algebraic expression.
Vanessa
c
\
L e t c represent the number of cans Vanessa collected.
c
Step 3: E x p r e s s i o n
10
The expression is c + 10.
Example 2
T r a d d bought two movie t i c k e t s a n d one bottle of water. T h e w a t e r
cost $2.50. Write a n expression to r e p r e s e n t the total amount h e
spent.
Step 1: The tickets cost an unknown amount. Define a
variable to represent the cost of one ticket.
i
'
^
Step 2: Show the cost of two tickets, plus $2.50.
^
I
i?
I
$2.50
The expression i s 2t + 2.50.
Exercises
Define a v a r i a b l e . T h e n w r i t e e a c h p h r a s e as a n algebraic expression.
1. seven fewer marbles than Dakota
Let d = the number of marbles
Dakota has; d — 7.
p
2. one third the volume of the pool Let p = the VOlume Of the pOOl; —.
3
3. nine times the cost of a baseball Let b = the COSt Of a baseball; 9fa.
4. Mei paid $8 to enter the carnival area and then bought 50 game tickets. Write a n
expression to represent the total amount she spent. Let t = the COSt of 3 game
ticket; 8 + SOL
Course 1 • Chapter 6 Expressions
93
NAME
DATE
PERIOD
Lesson 4 Extra Practice
Algebra: Write
Expressions
Define a variable and write each phrase as an algebraic expression.
1 . seven feet more than the height
2. twice the number of exercises
^r'-'K^
3. three times as many D V D s
i^d=44a number^ iv^-s
4. two years less than Carlos's age
5. R a y rode four miles less than Carole.
6.
Nestor exercised for 1 2 minutes more than Clare.
^
.
,
f r w
^4~\
^
7. The distance to the libr2iry is twice as many blocks as the distance to the theater
8. Caiisa is four inches taller tlian her friend Lily^
1^
Ulti's kijKt
C o u r s e 1 • C h a p t e r 6 Expressions
7^-T~1
NAME
DATE
PERIOD
Lesson 4 Skills Practice
Algebra: Write
Expressions
Define a v a r i a b l e . T h e n w r i t e e a c h p h r a s e as a n algebraic expression.
1. one more ball than is on the playground
Let b represent the number of balls on the playground; b + 1
2. three more cookies than are i n the j a r
Let c represent the number of c o o k i e s in the jar; c + 3
3. twelve fewer questions than were on the first test
Let q represent the number of q u e s t i o n s on the first test; q — 12
4. eight dollars more than the shirt costs
Let c represent the c o s t of the shirt; c + 8
5. three times as many drinks on the tray
Let d represent the number of drinks on the tray; 3d
6. five dollars less t h a n Yumi's pay
Let p represent Yumi's pay; p — 5
7. The English class has half as many students as the math class.
Let s represent the number of students in math c l a s s ; s -r 2
8. one third of E m i l y ' s age
Let a represent E m i l y ' s age; a -^ 3
9. ten times the minutes spent exercising
Let m represent the number of minutes spent exercising; 10m
10.
Spencer bought 3 books of stamps and mailed a package. I t cost $4.50 to mail the
package. Define a variable and write an expression to represent the total amount he
spent at the post office.
MAIL
Let s represent the c o s t of a book of s t a m p s ; 3s +
94
4.50
Course l • Chapter 6 Expressions