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

Sorted by Subject

Addition Sentences with Five Digit Numbers Learn Contents and Search
 Practice Next Lesson
 Play Previous Lesson
 Explore  Feedback

 

Addition equations with 5 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 22222 + 22222 = 44444.

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. 22222 + x = 44444). 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:
50000 + x = 120000
50000 + x - 50000 = 120000 - 50000
0 + x = 70000
x = 70000
Check the answer by substituting (70000) for x in the original equation. The answer is correct if the expressions on each side of the equals sign have the same value.
50000 + 70000 = 120000






Practice

What number would complete the sentence?

+ =  



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