Forming Expressions

A bag of crisps cost x pence, a chocolate bar costs y pence and a drink costs 90 pence.

Which expression represents the total cost of 4 bags of crisps?

• x pence

• 16 pence

• x + 4 pence

• 4x pence

Answer explanation

4 'lots of x' is written 4x

A bag of crisps cost x pence, a chocolate bar costs y pence and a drink costs 90 pence.

Which expression represents the total cost of 10 bars of chocolate?

• 10 pence

• y pence

• y10 pence

• 10y pence

A bag of crisps cost x pence, a chocolate bar costs y pence and a drink costs 90 pence.

Which expression represents the total cost of 3 bags of crisps and 5 bars of chocolate?

• 3x pence

• 5y pence

• 8xy pence

• 3x + 5y pence

A bag of crisps cost x pence, a chocolate bar costs y pence and a drink costs 90 pence.

Which expression represents the total cost of 2 bags of crisps and a drink?

• x pence

• 2x pence

• 2x + 90 pence

• 92x pence

A bag of crisps cost x pence, a chocolate bar costs y pence and a drink costs 90 pence.

Which expression represents the total cost of m drinks?

• m + 90 pence

• m90 pence

• 90m pence

• 90 + m pence

A bag of crisps cost x pence, a chocolate bar costs y pence and a drink costs 90 pence.

Which expression represents the total cost of 5 bags of crisps, 7 bars of chocolate and z drinks?

• 5x + 7y + 90z pence

• 5x + 7y + z90 pence

• 5x7y90z pence

• 102xyz pence

Dane is y years old.

Becky is 6 years older than Dane.

Which algebraic expression represents how old Becky is?

• y + 6

• y - 6

• 6 - y

• 6y

Dane is y years old.

Cara is 6 years younger than Dane.

Which algebraic expression represents how old Cara is?

• y + 6

• y - 6

• 6 - y

• 6y

Answer explanation

Cara is 6 years younger than Dane so we need to take away (subtract)

Dane is y years old.

Dani is twice as old as Dane.

Which algebraic expression represents how old Dani is?

• y + 2

• y - 2

• 2 - y

• 2y

Answer explanation

'Twice' as old means 2 times older.

Dane is y years old.
Elle is half Dane's age.
Which algebraic expression represents how old Elle is?

• 2y

• y2

Answer explanation

$\frac{y}{2}$ means y divided by 2


Finding a half of a number is the same as dividing by 2.