Evaluate Expressions

Evaluate Expressions

Vocabulary

​A variable, like x, is a letter or symbol used to represent an unknown amount.

​

An expression, like x + 2, is a combination of variables, numbers, and at least one operation. ​

Evaluating Expressions Example

Example: x + 1 when x = 2

​

Replace the variable, x, with 2. Your new problem turns into 2 + 1 which equals 3.​

Evaluating Expressions Example

Example: w - 3 when w = 5

​

Replace the variable, w, with 5. Your new problem turns into 5 - 3 which equals 2.

Multiple Choice

In the expression 5 - w

the operation is

• 5

• -

• w

Multiple Choice

In the expression 5 - w

the variable is

• 5

• -

• w

Multiple Choice

In the expression 5 - w

the number is

• 5

• -

• w

Multiple Choice

Solve if a=4

4 + a

• 4

• 0

• 8

• 16

Multiple Choice

Solve if a=4

a x 7

• 3

• 11

• 2

• 28

Multiple Choice

Solve if a=4

a x a - 10

• 2

• 6

• 9

• 5

Poll

How do you feel about evaluating expressions?

• I got it!

• I think I understand...

• I need more help.

• I have no idea what to do

Draw

Draw a picture of how you feel about evaluating expressions.