AAAMath.com
Sorted by Grade Level
 Contact AAA Math       Spanish version     New!! AAAMath lessons translated to over 100 languages

Sorted by Subject

Addition/Subtraction Relationship Learn Contents and Search
 Practice Next Lesson
 Play Previous Lesson
 Explore  Feedback

 

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






Practice

What number should replace the question marks?

 



You have correct and   incorrect.  This is percent correct.

Return to Top



Play
GameWhat 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

Return to Top

Explore
Math Lessons by Grade
Math Topics

How do AAAMath lessons map to Common Core State Standards?


Try our new mobile friendly design at aaaKnow.com



Math Resources

Spelling Lessons by Grade

Vocabulary Lessons by Grade

Geography

Return to Top



Copyright © 2012 J. Banfill. All Rights Reserved. Legal Notice