Explain how you know to use a variable in an addition or subtraction expression
http://www.mathvillage.info/node/7
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To know when to use a variable in an addition or subtraction expression, you need to understand the concept of representing quantities or values that can change in a mathematical equation. A variable is a symbol that can hold different values, and it allows you to solve equations and perform mathematical operations in a more flexible way.
When you come across a problem that involves adding or subtracting a specific value, you can use a variable to represent that value. For example, let's say you have a problem that asks you to find the sum of two numbers, one of which is 5 more than the other. You can use a variable, let's say "x," to represent the unknown number. The other number can then be represented as "x + 5" because it is 5 more than "x." The expression for the sum of the two numbers would be "x + (x + 5)."
By using the variable, you can generalize the equation and apply it to different scenarios. You can solve the equation by substituting different values for "x" and perform the addition or subtraction operation accordingly. The value of "x" will determine the result of the expression.
Variables are particularly useful when you don't know the exact values of the quantities involved in a problem or when dealing with unknown or changing values. They allow you to represent these unknown values symbolically and solve equations more efficiently.