Representing a generalised number | Maths | Quizalize & Oak National Academy

Starter quiz

An __________ is used to show one number or calculation is equal to another.

addition

equation ✓

exponent

expression
It costs £5 to enter a fairground and then £2 for each ride. How much would it cost to enter the fair and ride 3 rides? ______

'£11' ✓
Select any calculation which represents the statement "I am thinking of a number. I multiply it by 10, then add 5, then subtract 2"
Which of these bar models represent the equation shown?
In a game, these shapes are worth different amounts of points. If a square is worth $6$ and a circle is worth $4$ , what is the total number of points in the diagram shown? ______

'32' ✓
In a game, these shapes are worth different amounts of points. If a square is worth $2$ and a circle is worth $-5$ , what is the total number of points in the diagram shown? ______

'-2' ✓

Match the keyword to the definition

equation

⇔

a mathematical statement showing one thing equal to another ✓

generalised rule

⇔

a statement that applies to all relevant cases in a scenario ✓

unknown

⇔

a quantity that has a set value, represented by a letter ✓

variable

⇔

a quantity that has a range of values. ✓
True or false: It is always possible to work out the value of a variable.

True - with enough information you can use a bar model to find the value.

False - variables do not have set values, they vary depending on the situation ✓
Which equation is represented by the bar model below?

$y+2=x-5$

$x+5-2=y$ ✓

$y-2-5=x$

$y=x-2$
Select the statement that can be represented by the equation $a-4+2=19$

I am thinking of a number, I add 4 and 2 then subtract from my number to get 19

I am thinking of a number, I subtract it from 19 and the answer is $4+2$

I am thinking of a number, I subtract 4 then add 2 and my answer is 19 ✓

I am thinking of a number, I subtract 4 and 2 to get 19
A taxi journey costs £3 plus £2 per mile travelled. Which equation represents this?

$c=2a+3$ ✓

$3+2=c$

$3a+2b=c$

$3a+2=c$
A taxi journey costs £3 plus £2 per mile. What is the maximum number of miles you could travel if you had £15 to spend? ______

'6' ✓

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Pupils often think a=1 b=2 ... or that a letter represents an object

Letters represent a numerical value either unknown or variable. Avoid always using the first letter of the words used in a scenario.

Unknown - An unknown is a quantity that has a set value but it is represented by a symbol or letter.
Variable - A variable is a quantity that can take on a range of values.