Write and 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

What is a variable?

Back

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

Front

What is a coefficient?

Back

A coefficient is a numerical factor that multiplies a variable in an expression. For example, in 5x, 5 is the coefficient.

Front

What is a constant?

Back

A constant is a fixed value that does not change. In the expression 3x + 4, 4 is the constant.

Front

How do you evaluate an expression?

Back

To evaluate an expression, substitute the values of the variables into the expression and perform the arithmetic operations.

Front

What does it mean to simplify an expression?

Back

Simplifying an expression means to combine like terms and reduce it to its simplest form.

Front

What is the order of operations?

Back

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

Front

What is the expression for the total cost of p CDs if each CD costs $14.25 and shipping is $4.50?

Back

The expression is 14.25p + 4.50.

Front

Evaluate the expression 6m + 4t if m=5 and t=3.

Back

The evaluation is 6(5) + 4(3) = 30 + 12 = 42.

Front

What is the expression for 5 less than the product of 6 and s?

Back

The expression is 6s - 5.