Name
Reteaching
2-1
Using Variables to Write
Expressions
Reteaching 2-1
A variable represents a quantity that can change. To use a variable to
write an algebraic expression for a situation, you need to decide which
operation is appropriate for the situation. To help you, some words and
phrases are listed below.
Word phrase
Variable
ten more than a number b
b
the sum of 8 and a number c
c
five less than a number d
d
15 decreased by a number e
e
the product of 8 and a number f
f
19 times a number g
g
the quotient of a number h divided by 2
h
a number i divided into 50
i
Operation
Algebraic
Expression
Addition
Subtraction
Multiplication
Division
b ! 10
8!c
d"5
15 " e
8f
19g
h#2
50 # i
Write each algebraic expression.
1. a number j divided by 5
Identify the operation.
Write the expression.
2. the sum of 2 and a number k
3. 6 times a number m
4. a number n divided into 9
5. 4 less than a number p
6. q fewer limes than 10
7. r tickets at $7 each
8. A field goal scores 3 points. Write an algebraic expression to
represent the number of points the Raiders will score from field goals.
Identify the operation
Write the expression.
Some children share 5 apples equally among themselves.
32
Topic 2
© Pearson Education, Inc. 6
9. Writing to Explain Write an algebraic expression to represent the
situation below. Explain how the expression relates to the situation.
Name
Reteaching
2-1
Using Variables to Write
Expressions
Reteaching 2-1
A variable represents a quantity that can change. To use a variable to
write an algebraic expression for a situation, you need to decide which
operation is appropriate for the situation. To help you, some words and
phrases are listed below.
Word phrase
Variable
ten more than a number b
b
the sum of 8 and a number c
c
five less than a number d
d
15 decreased by a number e
e
the product of 8 and a number f
f
19 times a number g
g
the quotient of a number h divided by 2
h
a number i divided into 50
i
Operation
Algebraic
Expression
Addition
Subtraction
Multiplication
Division
b ! 10
8!c
d"5
15 " e
8f
19g
h#2
50 # i
Write each algebraic expression.
1. a number j divided by 5
Division
the sum of 2 and a number k 2 + k
9÷n
a number n divided into 9
10 – q
q fewer limes than 10
Identify the operation.
2.
4.
6.
Write the expression.
3. 6 times a number m
5. 4 less than a number p
7. r tickets at $7 each
j÷5
6m
p–4
7r
8. A field goal scores 3 points. Write an algebraic expression to
represent the number of points the Raiders will score from field goals.
Identify the operation
Multiplication Write the expression.
3s
Some children share 5 apples equally among themselves.
5 ! t ; The words ‘share’ and ‘equally’ show that the operation
is division. The 5 refers to the apples. The variable, t,
refers to the number of children equally sharing the apples.
32
Topic 2
© Pearson Education, Inc. 6
9. Writing to Explain Write an algebraic expression to represent the
situation below. Explain how the expression relates to the situation.