Solve Subtraction Equations with Decimals

What is the main concept of solving subtraction equations with decimals

Use addition as the inverse operation to isolate the variable

What is the inverse of subtraction

Addition

What must you always do when adding or subtracting decimals

Line up the decimal points and annex zeros if needed

What is the definition of an equation

A math sentence with an equal sign that shows two sides are the same

What is the definition of an inverse operation

An operation that undoes another operation

Example solve z - 3.2 = 4.8

z = 8.0

How to check the solution for z - 3.2 = 4.8

Substitute z = 8.0 and see that 8.0 - 3.2 = 4.8

Example solve x - 6.75 = 2.25

x = 9.00

How to check the solution for x - 6.75 = 2.25

Substitute x = 9.00 and see that 9.00 - 6.75 = 2.25

What is the rule for solving subtraction equations with decimals

Add the decimal number to both sides

What should you always do after solving

Check your work by substituting the solution back into the original equation