Writing 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 numbers and performing the operations.

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 the difference between an expression and an equation?

Back

An expression does not have an equality sign and represents a value, while an equation states that two expressions are equal.

Front

How do you write an expression for the total cost of 'p' pizzas at 'c' dollars each?

Back

The expression is p * c.

Front

What is the expression for the sum of a number 'x' and 10?

Back

The expression is x + 10.

Front

How do you express the product of a number 'n' and 4?

Back

The expression is 4n.

Front

What is the expression for the difference between 15 and a number 'y'?

Back

The expression is 15 - y.

Front

How do you express the total earnings of a worker who earns 'w' dollars per hour for 'h' hours?

Back

The expression is w * h.

Front

What is the expression for the total amount after spending 's' dollars from 't' dollars?

Back

The expression is t - s.