Equality Explorer: Variables PhET Sim 6th-8th

Equality Explorer: VARIABLES

• * Solve and manipulate algebraic equations by applying properties of real numbers (in particular, the inverse properties of addition and multiplication) and properties of equality.

• * Solve and manipulate algebraic equations by substituting different values for a variable.

• * Use a balance model to solve an equation for an unknown, and justify your strategies for solving.

• * Solve an equation using only universal operations.

• " I will practice taught skills towards finding solutions → equality when comparing (L) side to (R) side of an equation. These skills will help me determine the appropriate value for a variable term."

Click the Variables button on the interactive screen to begin.

Which task will I be choosing now? Select below.

• 8.EE.C.8 8.EE.C.7a 8.EE.C.7 7.EE.B.4 7.EE.B.3 6.EE.B.6 6.EE.B.5

• Basics

• Numbers

• Variables

• Operations

Intro 2 Building an Equation

You should have clicked on the VARIABLES button - see above ex: graphic. If not then do so now and complete the question task below.

Place an "x" square on the (L) side of the balance then place "1" circle 3 times on the same side.

Check UR skills. Which screen is like yours?

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Now remember at this time you are only using ONE VARIABLE so

what number of CIRCLES is needed on the (R) side tray to make this EQUATION balanced?

Action: Place the balancing number of circles on the tray. Submit your discovery.

What is the number VALUE for the VARIABLE LETTER "x"?

Is it...

• 1

• 2

• 3

Click the RESET button located on the lower right corner of the screen.

Let's build another equation and then you can solve for the variable [x].

x + 2 = 7

x = ?

• 4

• 2

• 3

• 5

Click the RESET button located on the lower right corner of the screen.

Let's build another equation and then you can solve for the missing constant.

x + ​ ​ (a)   = 8

x = 3

• 5
• 3
• 1
• 2
• 4
• -1
• -2

Click the RESET button located on the lower right corner of the screen.

Let's build another equation and then you can solve for the variable [x].

x + 4 = 6

x = ​ (a)  

• 2
• 1
• 3
• 4
• 0

Click the RESET button located on the lower right corner of the screen.

Let's build another equation and then you can solve for the variable [x].

6 = x + 3

x = ​ (a)  

• 3
• 1
• 2
• 4
• -1
• -2
• -3

Click the RESET button located on the lower right corner of the screen.

Let's build another equation and then you can solve for the variable [x].

x - 8 = 12

x = ​ (a)  

• 20
• -20
• 15
• -15
• 5
• 8
• 30
• -30

You R NOW ready to test your self.

Click on the HOME button below on the interactive screen and then the "Solve It!" button.

Did you follow the directions? What does UR screen look like? Choose below.

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