Today is . WELCOME: huohai3983/44663  Home | Reg LoginAll user | setHomePage | Bookmark  
Home | Math Test Online | Addition | Subtraction | Multiplication | Division | Time | Worksheet(JPG/PDF) | CAI | Flash Games | 
 Recommendation article
 Article search
 
 Home--maths--Third Grade--Subtraction Equations - Two Digit Numbers

Subtraction Equations - Two Digit Numbers

Subtraction equations - 2 digit

An equation is a mathematical statement such that the expression on the left side of the equals sign (=) has the same value as the expression on the right side. An example of an equation is 60 - 40 = 20.

One of the terms in an equation may not be know and needs to be determined. Often this unknown term is represented by a letter such as x. (e.g. x - 40 = 20).

The solution of an equation is finding the value of the unknown x. To find the value of x we can use the additive equation property which says: The two sides of an equation remain equal if the same number is added to each side.

Example:
x - 50 = 70
x - 50 + 50 = 70 + 50
x - 0 = 120
x = 120
Check the answer by substituting the value of x (120) back into the equation.
120 - 50 = 70


What number would complete the sentence?

  -     =     





2006-12-14 22:44:16
Viewed 1988 times Close
Math Test Online Greatmathsites

Translate

Arabic  Chinese  French  German  Italian  Japanese  Korean  Portuguese  Spanish

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