AAAMath.com
Sorted by Grade Level
Contact AAA Math Contact AAA Math      Contact AAA Math Buy the AAA Math CD      AAA Math en Español Spanish version

Sorted by Subject

Relationship with SubtractionLearn LearnTable of Contents Table of Contents
Practice PracticeNext Lesson Next Lesson
Play PlayPrevious Lesson Previous Lesson
Explore Explore Feedback Feedback

Practice Your Spelling List

States of the United States

Nations of the World

 

Inverse relationship of Addition and Subtraction

There is an inverse relationship between addition and subtraction.

If a math fact is considered, for example 3 + 7 = 10. Then the following are also true:

  • 10 - 3 = 7
  • 10 - 7 = 3

Similar relationships exist for subtraction, for example 10 - 3 = 7. Then the following are also true:

  • 3 + 7 = 10
  • 7 + 3 = 10

The reason for this is that we are dealing with an equation. An equation is balanced or the same on either side of the equals (=) sign. If exactly the same thing is done to both sides of the equation, it will still be balanced or equal.

In the example above we start with the equation 3 + 7 = 10

  • Subtract the same number from both sides 3 + 7 - 3 = 10 - 3
  • On the left side the 3 and -3 produce 0 which leaves 7 = 10 - 3
  • Turning the equation around to be in more normal form 10 - 3 = 7






What number should replace the question marks?

 



You have correct and   incorrect.  This is percent correct.

Return to Top


Play
PlayGameWhat is it?Best Score
How many correct answers can you get in 60 seconds?
Extra time is awarded for each correct answer. Play longer by getting more correct.
How fast can you get 20 more correct answers than wrong answers?

Sudoku

Timez Attack Multiplication Video Game

Return to Top

Math Lessons by Grade
Math Topics

Math Resources

Spelling Lessons by Grade

Vocabulary Lessons by Grade

Geography

WorldPlenty.com

Other Interests

Return to Top



Copyright © 2009 J. Banfill. All Rights Reserved. Legal Notice

Copyright (C) 2009 J. Banfill. All Rights Reserved.