Algebraic Expressions and Operations

This lesson covers numerical and algebraic expressions, including how to write and evaluate them. It introduces variables and demonstrates their use in expressions involving addition, subtraction, multiplication, and division. The lesson also explains the order of operations for evaluating complex expressions.

What is a numerical expression?

• A number or group of numbers with operation symbols

• A mathematical equation with variables

• A sentence with an equal sign

• A letter representing an unknown number

How do you represent Randi's age one year from now if he is currently 12?

• 12 * 1

• 12 - 1

• 12 + 1

• 12 / 1

What is a variable in algebra?

• A letter used to represent an unknown number

• A number with operation symbols

• A sentence with an equal sign

• A mathematical equation

If Mr. Haskin's age is represented by X, how would you express his age two years ago?

• X + 2

• 2 - X

• 2 + X

• X - 2

How do you write an expression for adding 2 to 6?

• 2 - 6

• 6 - 2

• 2 + 6

• 6 + 2

What is the value of x + 5 when x equals 9?

• 14

• 15

• 13

• 12

How do you express the number of plums in two boxes if one box has n plums?

• n + 2

• 2n

• n - 2

• n / 2

How would you write M divided by 2 in algebra?

• M / 2

• M + 2

• M - 2

• M * 2

What is the first step in evaluating the expression 23R - 89 when R = 1728?

• Subtract 89 from 23

• Multiply 23 by 1728

• Add 89 to 23

• Divide 23 by 1728