Introduction to Order of Operations

Introduction to Order of Operations

I can understand what a mathematical expression is.

This week we will be exploring expressions. By the end of the week, you'll know how to write, explain, and evaluate numerical expressions involving the four operations.

Expressions are mathematical examples similar to equations.  The difference between equations and expressions is the equal sign.  

Here are some examples of expressions:

•  $7+9$  

•  $12\div2+3$  

•  $2\times\left(3+6\right)$  

•  $7\times N$  

Fill in the Blank

Fill in the blank to describe the mathematical example below.  

This mathematical example is an _________(equation or expression).

 $10\times10$  

Fill in the Blank

Fill in the blank to describe the mathematical example below.  

This mathematical example is an _________(equation or expression).

 $8=2\times4$   

Fill in the Blank

Fill in the blank to describe the mathematical example below.  

This mathematical example is an _________(equation or expression).

 $2\left(10+3\right)$   

Fill in the Blank

Fill in the blank to describe the mathematical example below.  

This mathematical example is an _________(equation or expression).

 $\left(6\times2\right)+2=2\times7$   

Poll

Which expression describes the operation below:

three times six

•  $3\times6=18$  
  

•  $6+6+6$  
  

•  $3\times6$  
  

Poll

Which expression describes the operation below:

ten divided by two

•  $10\div2$   

•  $2\div10$  

•  $10\div2=5$  

Poll

Which expression describes the operation below:

2 less than 7

•  $2-7$   

•  $7-2$  

•  $7-2=5$  

Poll

Which expression describes the operation below:

5 times more than 10

•  $5+10$   

•  $5+50$  

•  $10\times5$  

Poll

Which expression describes the operation below:

half of twenty

•  $20\div2$   

•  $20\div10$  

•  $2\times20$  

All expressions have a value. We can refer to these values with a specific name depending on the operation.

The four operations are addition, subtraction, multiplication and division.

Poll

Which expression describes the operation below:

the product of 7 and 3

• $7+3$

• $7-3$

• $7\times3$

• $7\div3$

Poll

Which expression describes the operation below:

the difference between 9 and 5

•  $9+5$  

•  $9-5$  
  

•  $9\times5$ 

•  $9\div5$ 

Poll

Which choice correctly explains the expression below?

 $20+20$  

• the sum of 20 and 20

• the difference between 20 and 20

• the product of 20 and 20

• the quotient of 20 and 20

Poll

Which choice correctly explains the expression below?

 $50\div10$  

• the sum of 50 and 10

• the difference between 50 and 10

• the product of 50 and 10

• the quotient of 50 and 10

Fill in the Blank

What is the value of the expression below?

 $4\times8$  

Fill in the Blank

What is the value of the expression below?

 $125\div25$ 

Fill in the Blank

What is the value of the expression below?

 $\left(142+39\right)$ 

Multiple Select

Which statements have a value of 30? Pick all that apply.

• the product of 3 and 10

• the sum of 15 and 2

• the sum of 8 and 22

• the product of 30 and 1

Multiple Select

Which statements have a value of 10? Pick all that apply.

• the difference between 10 and 1

• the quotient of 20 and 2

• the quotient of 50 and 10

• the difference of 100 and 90

Multiple Select

Which statements have a value of 5? Pick all that apply.

• the sum of 2 and 3

• the difference of 7 and 2

• the product of 2 and 3

• the quotient of 20 and 4

Multiple Select

Which statements have a value of 120? Pick all that apply.

• the sum of 60 and 2

• the difference of 200 and 8

• the product of 10 and 12

• the quotient of 20 and 6

Open Ended

Reflect: How would you describe a mathematical expression to a friend who was absent today?