Today is . WELCOME: Riki/44674  Home | Reg LoginAll user | setHomePage | Bookmark  
Home | Math Test Online | Addition | Subtraction | Multiplication | Division | Time | Worksheet(JPG/PDF) | CAI
 Recommendation article
 Article search
 Home--maths--Third Grade--Addition equations with 3 digit numbers

Addition equations with 3 digit numbers

Addition equations with 3 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 222 + 222 = 444.

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. 222 + x = 444). 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.

500 + x = 1200
500 + x - 500 = 1200 - 500
0 + x = 700
x = 700
Check the answer by substituting (700) for x in the original equation. The answer is correct if the expressions on each side of the equals sign have the same value.
500 + 700 = 1200

What number would complete the sentence?

  +     =      

2006-11-24 19:06:54
Viewed 1479 times Close
Math Test Online Greatmathsites


Arabic  Chinese  French  German  Italian  Japanese  Korean  Portuguese  Spanish

Thank you to online math channels' Mathematics Department for hosting these lessons.
Copyright © 2006 - 2008 GZtrain Inc. All Rights Reserved