Home > Math Worksheets > Algebra Worksheets > Subtraction Principle in Equations

The goal with the sheets below is to practice solving for variables by applying the subtraction principle in order to balance algebraic expressions. Some of the problems require the conversion of a fraction first. There are a number of problems in here that require you to do more than just find the difference between two items to fully solve it.

These worksheets demonstrate how to find the value of a variable by manipulating the known numbers in the equation. Also included are practice worksheets, review sheets, and quizzes to help master the skill.

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Subtraction Principle - Lesson

Follow the steps to find value of the variable in this equation: y + 5 = 18

Worksheet 1

Find value of the variable in the following 10 problems. Example: x + 3 = 4

Worksheet 2

Find value of the variable in the following 10 problems. Example: 4 + z = 9

Review Sheet

Follow the steps to find value of the variable in this equation: y + 3 = 10

Quiz

Find the value of the variables in each of these 10 equations, then check your answers and add up your total score at the bottom. Example: x + 5 = 4

Do Now

Complete the problems, then put your answer in the "My Answer" box. Example: x + 7 = 12

Meet the Skill

Follow the steps to find the value of x in this equation: x + 4 = 2x + 6

Try the Skill

Find value of variable x: 6 x + 12= 4 + x

Practice the Skill

Find the value of the variables in these 10 equations. Example: 1 x + 9 = 8

Practice the Skill Twice

Find the value of the variables in these 10 equations. Example: y + 3y = 15 - 4

Show the Skill

Find the value of the variables in these 8 equations. Example: 1 -4x = 8

Warm Up

Practice finding the value of a variable. Example: 15x = -10x + 52