Integer Addition equations
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 2 + (- 6) = – 4.
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. 2 + x = – 4).
The solution of an equation is finding the value of the unknown x. To find the value of x we can use the subtractive equation property which says: “The two sides of an equation remain equal if the same number is subtracted from each side.” We may also 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:
– 5 + x = 4
– 5 + x + 5 = 4 + 5
0 + x = 9
x = 9
Check the answer by substituting the answer (9) back into the equation.
– 5 + 9 = 4
Explanation:
Integer Addition equations with 3 digit integers
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 200 + (- 600) = – 400.
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. 200 + x = – 400).
The solution of an equation is finding the value of the unknown x. To find the value of x we can use the subtractive equation property which says: The two sides of an equation remain equal if the same number is subtracted from each side. We may also 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:
– 500 + x = 400
– 500 + x + 500 = 400 + 500
0 + x = 900
x = 900
Check the answer by substituting the answer (900) back into the equation.
– 500 + 900 = 400
Integer Addition equations with 4 digit integers
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 2000 + (- 6000) = – 4000.
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. 2000 + x = – 4000).
The solution of an equation is finding the value of the unknown x. To find the value of x we can use the subtractive equation property which says: The two sides of an equation remain equal if the same number is subtracted from each side. We may also 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:
– 5000 + x = 4000
– 5000 + x + 5000 = 4000 + 5000
0 + x = 9000
x = 9000
Check the answer by substituting the answer (9000) back into the equation.
– 5000 + 9000 = 4000
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