Writing Expressions

Front

What is an expression in mathematics?

Back

An expression is a combination of numbers, variables, and operators (like +, -, ×, ÷) 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.

Front

What is the sum of two numbers?

Back

The sum is the result of adding two numbers together.

Front

What is the difference between a variable and a constant?

Back

A variable is a symbol (like x or y) that represents a number that can change, while a constant is a fixed value that does not change.

Front

What does 'decreased by' mean in an expression?

Back

'Decreased by' indicates subtraction; for example, 'u decreased by 17' means u - 17.

Front

What does 'increased by' mean in an expression?

Back

'Increased by' indicates addition; for example, 'h increased by 5' means h + 5.

Front

What is the product of a number and 2?

Back

The product of a number and 2 is represented as 2 times that number, or 2n.

Front

What is the quotient of a number and 4?

Back

The quotient of a number and 4 is represented as n ÷ 4.

Front

How do you represent 'half of a number c' in an expression?

Back

Half of a number c is represented as c ÷ 2.

Front

What does 'twice a number' mean?

Back

'Twice a number' means to multiply that number by 2, represented as 2n.