3-Digit Subtraction Sentences
Subtraction Equations: Learn
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 600 - 400 = 200.
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 - 400 = 200).
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.
Check the answer by substituting (1200) for x in the original equation. The answer is correct if the expressions on each side of the equals sign have the same value.
1200 - 500 = 700
700 = 700 (Correct!)
Subtraction Sentences: Practice
What number would complete the equation?
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Math Lessons by Grade
- Estimation and Mental Math
- Naming Numbers
- Percents and Ratios
- Place Value