WALT: Use a range of operations
When completing a function machine you will be given a number. That number will enter the function machine where an operation is applied such as a multiplication, division, addition or subtraction. The number that exits the function machine is the answer.
IN: 6 Operation: X6 OUT: ??
As 6 is the number entering I must apply the operation 'X6' to it.
6X6 = 36, therefore the number that comes out is 36.
IN: 6 Operation: X6 OUT: 36
Some function machines may give you the information in a way that forces you to work backwards.
IN: ?? Operation: ÷ 4 OUT: 4
In order to complete this function we must work backwards. However, because we are working backwards we must do the opposite (e.g division turns to multiplication).
I start with the 4, I work backwards through the function machine. As I am working backwards the ÷4 becomes x4.
4 X 4 = 16
Therefore my IN number must be 16.
IN: 16 Operation: ÷ 4 OUT: 4