6th STAAR - One-Step Equations & Inequalities

One Step Equation

Review

Expression

• Mathematical phrase with a combination of numbers, variables, and operations

• DOES NOT have an equal sign

• Example: 5x + 1

• Non example: 7p = 21

Multiple Choice

True or False: An expression has an equal sign.

• True

• False

Equation

• A mathematical sentence stating two expressions are equivalent

• HAS an equal sign

• Example: 8r + 5 = 3

• Non Example: 8r + 5

Multiple Choice

Which of the following has an equal sign?

• Equation

• Expression

A mathematical process:

• Addition

• Subtraction

• Multiplication

• Division

Operations

Multiple Choice

What operation is shown here?

r - 5

• addition

• subtraction

• multiplication

• division

Multiple Choice

What operation is shown here?

C + 5

• addition

• subtraction

• multiplication

• division

Multiple Choice

What operation is shown here?

10p

• addition

• subtraction

• multiplication

• division

Multiple Choice

What operation is shown here?

$$\frac{r}{10}$$  

• addition

• subtraction

• multiplication

• division

Solving Equations

• Use INVERSE OPERATIONS to isolate the variable

• Keep the equation balanced by performing the same operation on both sides of the equal sign.

Inverse Operations

Solve y + 14 = 20

• The inverse operation of addition is subtraction.

• Subtract 14 from both sides of the equal sign

• 20-14=6

• y=6

Solve x - 120 = 80

• The inverse operation of subtraction is addition

• Add 120 to both sides of the equal sign.

• 80 +120= 200

• x=200

Solve 3n = 12

• The inverse operation of multiplication is division

• Divide both sides by 3

• 12/3=4

• n=4

• The inverse operation of division  is multiplication 

• Multiply both sides by 2

• 16(2)=32

• k=32

Multiple Choice

What is the inverse operation of Multiplication?

• addition

• subtraction

• multiplication

• division

Multiple Choice

What is the inverse operation of addition?

• addition

• subtraction

• multiplication

• division

Multiple Choice

What is the inverse operation of subtraction?

• addition

• subtraction

• multiplication

• division

Multiple Choice

What is the inverse operation of division?

• addition

• subtraction

• multiplication

• division

Multiple Choice

n + 4 = 12

• 16

• 3

• 8

• 7

Multiple Choice

12 = x + 7

• 5

• 19

• 84

• 6

Multiple Choice

41 = 3 + x

• 44

• 42

• 38

• 71

Multiple Choice

71 = s + 38

• 109

• 47

• 34

• 33

Multiple Choice

x - 7 = 2

• 5

• 9

• 7

• 14

Multiple Choice

s - 17 = 87

• 70

• 94

• 60

• 104

Multiple Choice

48 = x - 37

• 85

• 11

• 16

• 75

Multiple Choice

n - 18 = 3

• 15

• 21

• 54

• 22

Multiple Choice

7x = 42

• 294

• 6

• 7

• 284

Multiple Choice

9n = 45

• 6

• 5

• -5

• 7

Multiple Choice

6b = 30

• x = 36

• x = 24

• x = 180

• x = 5

Multiple Choice

3x = 27 

• x = 24

• x = 81

• x = 9

Multiple Choice

Solve for x:

• x = 20

• x = 7

• x = 10

• x = 3

Multiple Choice

Solve the equation below:

• k = 152

• k = 176

• k = 5

• k = 27

Multiple Choice

• 4.5

• 4.2

• 15

• 51.84

Multiple Choice

• 6.1

• 12.7

• -11.2

• 27.3