Evaluate and Write Expressions

Evaluate and Write Expressions

Objective

• Evaluate expressions containing parentheses

• write numerical expressions containing parentheses

• interpret numerical expressions without evaluating them 

Vocabulary

• Evaluate: to find the value of an expression

• Parentheses ( ): A grouping symbol; they represent a part of the problem that should be done before others

Multiple Choice

What operation do you use to find the cost of a drink and a popcorn for one person?

• multiplication

• division

• addition

• subtraction

Multiple Choice

How much would it cost for 2 people compared to the cost of one?

• It would be the same

• it would be twice as much

Open Ended

How would you find the cost for two people?

Multiple Choice

How much does it cost for Maria to buy a popcorn and a drink for two people?

• $13

• $5

• $8

• $26

Open Ended

Maria thought she could use the equation 2x5+8=18 to find the cost. Explain why she is not correct.

To Evaluate an expression means to find it's value

To evaluate 2x5+8 you must first multiply 2x5, then add 8. But what if tou wanted to add 5 and 9 and then multiply by 2?

Multiple Choice

What are parentheses?

• they tell you how many times to multiply the base by itself

• grouping symbols which should be solved 1st in an expression

Multiple Choice

Evaluate 0.50 x (24+8) to find the cost of the erasers.

• 16

• 20

• 32

• 5/6

Multiple Choice

Sara buys a shirt that costs $12 and a pair of pants that regularly costs $26. They are on sale, so she only need to pay half of the regular cost. Evaluate the expression

 $\frac{1}{2}\times\left(12+26\right)$  to find Sara's cost in dollars. 

•  $\frac{38}{1}$  

•  $\frac{7}{8}$  

• 32

• 19

Multiple Choice

Which expression best represents "15 minus the sum of 6 and 7"

• 15 - 6 + 7

• 15 - (6+7)

• (6+7) -15

• 6-7+15

Multiple Choice

Write a numerical expression to represent "15 divided by the sum of 1 and 4"

• 
  

  $15\ \div\ 1+4$
  

• $15\div\left(1+4\right)$

• $1+4\div15$