9.6 Evaluate Expressions

Front

What does it mean to evaluate an expression?

Back

To evaluate an expression means to find its value by substituting numbers for the variables and performing the operations.

Front

If a = 2, what is the value of 3 + a?

Back

5

Front

If b = 5, what is the value of b x 4?

Back

20

Front

If a = 2, what is the value of 12 ÷ a + 4?

Back

10

Front

If g = 2, what is the value of g x 5 - 5?

Back

5

Front

If g = 2, what is the value of (5 - 5) x g?

Back

0

Front

What is a variable in mathematics?

Back

A variable is a symbol, often a letter, that represents a number that can change.

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). It is often abbreviated as PEMDAS.

Front

What is the value of 10 - 2 x 3?

Back

4 (because you multiply first: 2 x 3 = 6, then subtract: 10 - 6 = 4).

Front

What does it mean to substitute in an expression?

Back

To substitute means to replace a variable with a specific value.