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 write an expression for 'three times a number'?

Back

It means to multiply that number by 3, represented as 3d if 'd' is the number.

Front

How do you express 'three more than a number'?

Back

You add 3 to that number, represented as C + 3 if 'C' is the number.

Front

What does 'half as many' mean in an expression?

Back

It means to divide the number by 2, represented as s ÷ 2 if 's' is the number.

Front

How do you express 'twelve fewer than a number'?

Back

You subtract 12 from that number, represented as q - 12 if 'q' is the number.

Front

What is the expression for the cost of 3 items at a price 'c' each and an additional cost of 'd'?

Back

The expression is 3c + d.

Front

What does the term 'variable' mean in mathematics?

Back

A variable is a symbol (like x or y) that represents an unknown value.

Front

What is the difference between an equation and an expression?

Back

An equation states that two expressions are equal, while an expression does not include an equality sign.

Front

How do you express 'the sum of a number and 10'?

Back

You add 10 to that number, represented as n + 10 if 'n' is the number.

Front

What does 'decrease by' mean in an expression?

Back

It means to subtract a certain amount from a number.