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

Addition Sentences with Two Digit NumbersLearn 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

 

Addition equations with 2 digit numbers

An equation is a mathematical statement that has an expression on the left side of the equals sign (=) with the same value as the expression on the right side. An example of an equation is 22 + 22 = 44.

One of the terms in an equation may not be known and needs to be determined. The unknown term may be represented by a letter such as x (e.g. 22 + x = 44). The equation is solved by finding the value of the unknown x that makes the two sides of the equation have the same value.

Use the subtractive equation property to find the value of x in addition equations. The subtractive equation property states that the two sides of an equation remain equal if the same number is subtracted from each side.

Example:
50 + x = 120
50 + x - 50 = 120 - 50
0 + x = 70
x = 70
Check the answer by substituting (70) for x in the original equation. The answer is correct if the expressions on each side of the equals sign have the same value.
50 + 70 = 120






What number would complete the equation?

  +     =      



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.