Introduction to Evaluating One-Step Algebraic Expressions

The video tutorial teaches how to evaluate one-step algebraic expressions by substituting a given number for the variable. It begins with an introduction to algebraic expressions, highlighting common mistakes like forgetting to substitute the variable. The tutorial then demonstrates evaluating expressions such as 9 minus x, 9 plus x, 9 divided by x, and 9 times x, using x=3. It further explores evaluating the expression 15 times x with different values for x, including 3, 4, and 10. The lesson concludes by summarizing the process of evaluating one-step expressions.

What is a common mistake when evaluating algebraic expressions?

• Forgetting to perform the operation

• Using the wrong operation

• Substituting the wrong number

• Forgetting to substitute the variable

If x equals 3, what is the result of 9 minus x?

• 12

• 9

• 6

• 3

What is the value of 9 divided by x when x equals 3?

• 1

• 2

• 3

• 4

When x equals 4, what is the result of 15 times x?

• 50

• 45

• 70

• 60

What is the value of 15 times x when x equals 10?

• 150

• 130

• 120

• 100