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ALGEBRAIC EXPRESSIONS

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by

Taylor Way

on 20 October 2014

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Transcript of ALGEBRAIC EXPRESSIONS

ALGEBRAIC EXPRESSIONS
Review
Variable - is a
letter
or
symbol
that represents an unknown quantity.

Algebraic Expressions
You can use
algebraic expressions
to explain a relationship between
quantities.
Words that Lead to Addition
Add
Addition
Sum
Plus
Increases
Words that Lead to Division
Divide
Division
Quotient
Goes Into
How Many Times
Algebraic Expression
- contains at least
one
variable and does not contain an
equal

sign.
Algebraic Expressions
Since an algebraic expression contains a
variable
, we can evaluate the expression if we are given what
the variable equals.
Words that Lead to Subtraction
Subtract
Subtraction
Minus
Less
Difference
Words that Lead to Multiplication
Multiply
Multiplication
Product
By
Times
Example: T + 3
Example: If m = 8, solve the expression m + 5.
m + 5
8 + 5
13
Example: Her math grade decreased by 6 points. Let g represent her math grade.
g - 6
More Than
Altogether
Total
Decreases
Take Away
Deduct
Practice Problems
1. Five plus y

2. 6 times q

3. 2 less than x
Answers
1. Five plus y

2. 6 times q

3. 2 less than x
5 + y

6q

x - 2
More Practice Problems
4. Evaluate 7y, when y = 2.

5. Evaluate 6 -w, when w = 1.
Answers
4. Evaluate 7y, when y = 2.
14

5. Evaluate 6 -w, when w = 1.
5
Write Algebraic Expressions for These Word Phrases
Ten more than a number
A number decreased by 5
6 less than a number
A number increased by 8
The sum of a number and 9
4 more than a number
Write Algebraic Expressions for These Word Phrases
A number "s" plus 2
A number decreased by 1
31 less than a number
A number "b" increased by 7
The sum of a number and 6
9 more than a number
A number "s" plus 2
s + 2
A number decreased by 1
k - 1
31 less than a number
x - 31
A number "b" increased by 7
b + 7
The sum of a number and 6
n + 6
9 more than a number
z + 9

Answers
Write an Algebraic Expression for These Situations
Scott's brother is 2 years younger than Scott


The sum of two numbers is 12


The difference between two numbers is 5


Answers
Scott's brother is 2 years younger than Scott
s - 2

The sum of two numbers is 12
v + c = 12

The difference between two numbers is 5
m - n = 5

Write an Algebraic Expression for These Situations
A cake will serve 12 people. Write an expression for how many people will "C" cakes serve.


The drama club sold 60 more tickets on Saturday than on Friday (f). Write an expression for the number of tickets sold on Saturday.


Answers
A cake will serve 12 people. Write an expression for how many people will "C" cakes serve.
12c

The drama club sold 60 more tickets on Saturday than on Friday (f). Write an expression for the number of tickets sold on Saturday.
f + 60


Whole Class Practice
Solve the following expressions if p = 5 and w = 6.
1) 7 + p
2) 5p + 4w
3) (p +w) + p
2
4) 2w - p
Full transcript