Writing Equations and Expressions

Writing Algebraic

Expressions and Equations

Objective

🎯write algebraic expressions and equations corresponding to a real-life situation

🎯Define and use multiple variables

🎯Understand the connection between different operational keywords.

Poll

Would you rather be a

• bear

• tiger

• shark

• eagle

• fly

Poll

How are you feeling today?

Expression v Equation

An expression is a number, a variable, or a combination of numbers and variables, and operation symbols.

An equation is made up of two expressions connected by an equal sign.

Multiple Choice

Rebecca paid $324 for concert tickets. Rebecca bought "x" amount of tickets.

Choose the expression that shows how much each ticket cost.

• $$324+x$$

• $$324-x$$

• $$324\times x$$

• $$324\div x$$

Multiple Choice

Ben had "x" dollars. Cam has 7 fewer dollars than Ben.  

How much money does Cam have? Write your answer as an expression.

• $$x+7$$  

• $$x-7$$  

• $$x\times7$$  

• $$x\div7$$  

Multiple Choice

Jordan makes 100 dollars each week. He worked for x weeks this summer.

How much money did Jordan make this summer? Write your answer as an expression.

• $$100+x$$

• $$100-x$$

• $$100\times x$$

• $$100\div x$$

Multiple Choice

If there are 20 balloons at a party and a number (b) of them burst, how many balloons are left?

Write the phrase as an expression:

• b - 20

• 20(b)

• 20 - b

• 20 + b

Multiple Choice

Perry has 17 fewer baseball cards than Pete.
If b represents the number of cards Pete has, write an expression for how many baseball cards Perry has.

• b + 17
• b -17
• 17 - b
• 17 + b

Multiple Choice

z - 4

• 4 inches ahead
• 4 less than z
• 4 times as many
• one-fourth the size

Multiple Choice

Write the expression. 
Five dollars less than Tim's pay. 

• p + 5
• p - 5
• 5p
• p ÷ 5

Multiple Choice

Write the expression.
Twelve fewer questions than were on the first test. 

• 12 + q
• q - 12
• q x 12
• q ÷ 12

Multiple Choice

Write the expression.
Three more cookies than are in the jar. 

• C x 3
• C - 3
• C + 3
• C ÷ 3

Poll

I can write expressions or equations from a given word problem

• SUPER confident

• I know what to do, but could use the help

• what's an expression and equation?

Multiple Choice

A number five times is twenty five.

• 3x = 25

• 4x = 25

• 5x = 25

• 6x = 24

Multiple Choice

The sum of x and ten is twenty.

• x - 10 = 20

• x + 10 = 20

• x + 10 = 25

• 10x = 20

Multiple Choice

Two less than a number is fourteen.

• x - 2 = 14

• 2 - x = 14

• x - 2 = 15

• 2 - x = 13

Multiple Choice

Jo is thinking of a number. Four less than 9 times the number is 176. How could I find Jo's number?

• 9x - 4 = 176

• 4 - 9x = 176

• 9x + 4 = 176

• 4x + 9 = 176

Multiple Choice

2. Cheryl gets paid $8 per hour for her job at the record store.  She made a total of $96 last week.  Which equation models this situation?

• 96h = 8

• h/96 = 8

• 8h = 96

• h/8 = 96

Multiple Choice

What equation matches this situation?
John wants to buy an MP3 Player that costs $30.98.  How much change did he receive if he gives the cashier $40.

• 40 + c = 30.98

• 30.98 + c = 40

• c - 40 = 30.98

• c - 30.98 = 40

Multiple Choice

1. Ted bought a dolphin poster for $12.  He now has $5.  Which choice models this situation?

• m - 12 = 5

• m - 5 = 12

• m + 5 = 12

• m + 12 = 5

Multiple Choice

4. There are 3 tennis balls in each can.  The coach bought a total of 27 tennis balls.  Which choice models this situation?

• x/3 = 27

• 27x = 3

• x/27 = 3

• 3x = 27

Multiple Choice

5.  After dropping 5ºF, the temperature was 37ºF.  Which choice models this situation?

• d - 37 = 5

• d + 5 = 37

• d - 5 = 37

• d + 37 = 5

Multiple Choice

Which choice models this situation?
Robyn had some video games, then bought 4 more.  Now she has a total of 10 games.

• v - 4 = 10

• v + 4 = 10

• 10/4 = v

• 4v = 10

Multiple Choice

Last Friday Stefan had $35. Over the weekend, his parents gave him some money for washing the car and now he has $47. Write an equation to determine how much his parents paid him for washing the car.

• $$35-x=47$$

• $$\frac{x}{35}=47$$

• $$35+x=47$$

• $$35x=47$$

Multiple Choice

Which choice models this situation?

Jack needed new pencils for school today. He took 6 pencils from a new box of pencils. If there are 18 pencils left in the box, how many pencils were in the brand new box?

• p - 6 = 18

• p + 6 = 18

• 6p = 18

• p/6 = 18