One step equations

One step equations

Finding the value of a variable

THE GOAL:

• Isolate the variable

• Find the value of the variable

INVERSE OPERATIONS

To UNDO addition, you need to subtract.

To UNDO subtraction, you need to add.

Subtraction Property of Equality

• For any addition equation, you can subtract an equal amount from both sides of the equation and the sides will remain equal.

Addition Property of Equality

For any subtraction equation, you can add an equal amount to both sides of the equation and the sides will remain equal.

Multiple Choice

What is the inverse operation of addition?

• Subtraction

• Addition

• Multiplication

• Division

Multiple Choice

What is the first goal when solving a one-step equation?

• Make a guess

• Isolate the variable

• Find the answer

• Add the opposite

Multiple Choice

Name the property:

1 + 5 = 5 + 1

• Isolation property

• Associative property

• Identity Property

• Commutative Property

Multiple Choice

Name the property:

Mrs. Leitch + 0 = Mrs. Leitch

• Associative property

• Identity property

• Commutative property

Multiple Choice

What is the first step to solve:

x + 3 = 5

• Calculate in my head

• Subtract 3 (undo +3) from the variable side of the equation

• Add 3

Multiple Choice

What is the first step to solve:

t - 3,692 = 125,999

• Grab a calculator

• Subtract 3,692 from both sides

• Add 3,692 to the variable side of the equation

• Subtract 125,999 from both sides

Multiple Choice

In order to isolate the variable in an equation, you

• move the numbers to the other side of the equal sign

• subtract from the answer.

• use inverse operations.

• erase everything but the variable.

Multiple Choice

What property changes the grouping of the numbers?

• Addition property of equality

• subtraction property of equality

• Commutative property of equality

• Associative property of equality

Multiple Choice

Solve:

r - 19 = 217

• r = 198

• r = 236

• r = 0

• r = why are there letters in math?

Multiple Choice

Solve for b:

93 = b - 27

• b = 120

• b = 66

• b = -66

Multiple Choice

Solve for p:

856 = p + 254

• p = 1000

• p = 1,110

• p = 602

• p = 612

Multiple Choice

Solve for m:

10,124 + m = 235,103

• m = 245,227

• m = 245,327

• m = 224,979

• m = 224,779

Multiple Choice

Solve for y:

y - 3 = 20

• y = 17

• y = 3

• y = 23

• y = -23