

Variables and Expressions
Presentation
•
Mathematics, Education
•
9th - 10th Grade
•
Medium
Standards-aligned
Christina Benavente
Used 101+ times
FREE Resource
7 Slides • 9 Questions
1
Variables and Expressions
Ms. Benavente
1st period

2
Key Vocabulary Terms
Numerical Expression
Variable
Variable expression
Evaluate
3
Expressions and Variables
A numerical expression is an equation that has numbers and operations ONLY
A variable is a letter of the alphabet that represents a number
A variable expression is an equation that has numbers, variables, AND operations
When you evaluate a variable expression, you are replacing the variable with the number.
4
Different types of variable expression & steps to EVALUATE a variable expression
5
Multiple Choice
What word means a letter that represents a number?
variable
numerical expression
variable expression
evaluate
6
Multiple Select
Click all that can be considered a NUMERICAL EXPRESSION
3 + 2
5x - 10
10x + 2
86 + 1020
7
Fill in the Blanks
Type answer...
8
Multiple Choice
When you evaluate a variable expression you are .....
replacing the variable with a number
looking at it
answering it
leaving it alone
9
Evaluate the expression to find out how many tons of food a blue whale eats in a feeding season of 120 days.
4 ⋅ d when d = 120
10
Evaluate the expression (continued)
4⋅120 Substitute 120 for d
480 Multiply 4 and 120
11
Evaluate the expression when
x = 10 and y = 4
14 Add
2. xy
10 ( 4 ) Substitute 10 for x and 4 for y
40 Multiply
12
Multiple Choice
Evaluate the expression when y = 12
y+820
22
28
19
13
Multiple Choice
Evaluate the expression when x = 6
9 − x10
3
11
12
14
Multiple Choice
Evaluate the expression when x = 6 and y = 12
y−x10
5
6
1
15
Multiple Choice
Evaluate the expression when x = 6 and y = 12
xy72
90
100
81
16
Poll
How are you feeling about this lesson?
I GET IT!
Kind of get it
HELP! I don't get it
Variables and Expressions
Ms. Benavente
1st period

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