When you evaluate an expression, you substitute a number in for a——-
variable
When you evaluate an expression, you substitute a number in for a variable. The variable is represented by a letter or a combination of letters that can take different values. By substituting a specific number for the variable, you can find the value of the expression.
When evaluating an expression, you substitute a number in for a variable.
To do this, you need to follow these steps:
1. Identify the variable in the expression: Look for any letter or symbol used to represent a value.
2. Choose a number to substitute for the variable: You can choose any number you want, as long as it fits within the acceptable range for the variable. Sometimes, the context of the problem or the expression itself may provide some guidance on which number to select.
3. Replace the variable with the chosen number: Replace every instance of the variable in the expression with the chosen number. Be careful to replace each occurrence correctly, without altering the structure of the expression.
4. Perform the necessary calculations: After replacing all the variables with the chosen number, perform any arithmetic operations, including addition, subtraction, multiplication, and division, following the order of operations (PEMDAS/BODMAS).
5. Simplify the expression: Continue evaluating the expression by following the order of operations until you obtain a final numerical value. At this point, you have successfully evaluated the expression by substituting a specific number in for the variable.