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 'increased by' mean in an expression?

Back

'Increased by' indicates addition. For example, '50 increased by x' means 50 + x.

Front

What does 'decreased by' mean in an expression?

Back

'Decreased by' indicates subtraction. For example, '10 decreased by n' means 10 - n.

Front

How do you express '8 times x' in mathematical terms?

Back

It is expressed as 8x.

Front

What is the expression for a pizza delivery driver earning $8 an hour for h hours and spending $20 on gas?

Back

The expression is 8h - 20.

Front

How do you express the total earnings of Cooper who earns $25 a day for d days?

Back

The expression is 25d.

Front

What is a variable in an expression?

Back

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

Front

What does the term 'coefficient' refer to in an expression?

Back

A coefficient is a number that multiplies a variable. For example, in 8x, 8 is the coefficient.

Front

What is the difference between an expression and an equation?

Back

An expression does not have an equality sign, while an equation does. For example, 2x + 3 is an expression, but 2x + 3 = 7 is an equation.

Front

How would you write an expression for 'the sum of a number x and 5'?

Back

It is written as x + 5.