Evaluate 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

Evaluate the expression 7h + 1.50d for h = 10 and d = 3.

Back

$74.50

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.

Front

Evaluate 2r + 1 if r = 3.

Back

7

Front

What is the formula for the difference of squares?

Back

a² - b² = (a + b)(a - b) for any numbers a and b.

Front

Evaluate a² - b² if a = 4 and b = 2.

Back

12

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

Evaluate 2a + 4b if a = 10 and b = 6.

Back

44

Front

What is a variable in an expression?

Back

A variable is a symbol (often a letter) that represents an unknown value in an expression or equation.

Front

Evaluate 8y + 12 - 2z for y = 4 and z = 2.

Back

40