Evaluating Expressions

Front

What is an expression in mathematics?

Back

An expression is a combination of numbers, variables, and operators (such as +, -, *, /) that represents a value.

Front

What does it mean to evaluate an expression?

Back

To evaluate an expression means to calculate its value by substituting the variables with given numbers and performing the operations.

Front

If m = -7 and n = 4, what is the value of 5m + 9n?

Back

1

Front

What is the result of evaluating x ÷ 4 if x = 80?

Back

20

Front

What is the order of operations in mathematics?

Back

The order of operations is Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right). Often abbreviated as PEMDAS.

Front

What is the first step in solving the expression 2(12 - 7) + 5?

Back

Subtraction (12 - 7 = 5).

Front

What is the second step in solving the expression 9 * 9 + 12 - 24?

Back

Addition (81 + 12 = 93).

Front

What is the missing operation in the acronym PEMDAS?

Back

Division.

Front

What is the value of the expression 3(4 + 5) - 2?

Back

25.

Front

How do you simplify the expression 6 + 2 * 3?

Back

First, multiply 2 * 3 to get 6, then add 6 + 6 to get 12.