Evaluating Expressions

Front

What is the order of operations in mathematics?

Back

The order of operations is a set of rules that determines the sequence in which calculations are performed. The acronym PEMDAS is often used: Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right).

Front

Evaluate the expression: -12 ÷ 6 (-3) + 8

Back

-14

Front

What does the absolute value of a number represent?

Back

The absolute value of a number represents its distance from zero on the number line, regardless of direction. For example, |3| = 3 and |-3| = 3.

Front

Evaluate 5|3-x| - 15 when x = 5

Back

-5

Front

What is a variable in an algebraic expression?

Back

A variable is a symbol (usually a letter) that represents an unknown value in an expression or equation. For example, in the expression 2x + 3, 'x' is the variable.

Front

Evaluate the expression: 2x(3x - y)^2 when x = 3 and y = 5

Back

96

Front

What is the formula for the perimeter of a rectangle?

Back

The formula for the perimeter (P) of a rectangle is P = 2L + 2W, where L is the length and W is the width.

Front

If the length of a rectangle is 20 inches and the width is 10 inches, what is the perimeter?

Back

60 inches

Front

What is an expression in mathematics?

Back

An expression is a combination of numbers, variables, and operators (such as +, -, ×, ÷) that represents a value. For example, 3x + 5 is an expression.

Front

What is the difference between an expression and an equation?

Back

An expression is a mathematical phrase that does not include an equality sign, while an equation is a statement that two expressions are equal, indicated by an equality sign.