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Coding and Algorithms
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India
Class V

Functions Machines

Lesson
Practice
Lesson

Making sausages

If you think of a sausage machine: something goes in, the machine works its magic, and sausages come out the other end! A function machine is a little like that, just with no sausages. We have 3 important things that happen though, just like a sausage machine.

Function machines

With a function machine, we have:

  • something going in (input)
  • something happening in the machine (operation)
  • something coming out (output)

Is that all?

Yes! It looks just like this. 

Let's watch a video to see how it works and how it can go in reverse as well.

 

Loading video...

Remember!

A function machine uses three special terms:

  • input
  • operation
  • output (We don't call this the answer)

Worked Examples

Question 1

Look at this function machine.

         
$$2

$$+$$1

 ?
         

  1. In the case above, what is the output of the function machine?

  2. If the input was changed to $$7, what would the new output of the function machine be?

Question 2

Look at this function machine.

         
$$5 arrow to indicate the process direction. the horizontal arrow is pointing to the right

?

 arrow to indicate the process direction. the horizontal arrow is pointing to the right $$7
         

  1. What is the operation of this function machine?

    $$2

    A

    $$7

    B

    $$+$$5

    C

    $$+$$2

    D

    $$−$$2

    E

    $$×$$2

    F

  2. We can reverse the direction of a function machine.

             
    $$5 arrow to indicate the process direction. the horizontal arrow is pointing to the left. thus the number before this figure is the output.

    ?

    		 arrow to indicate the process direction. the horizontal arrow is pointing to the left. thus the number before this figure is the input. $$7
             

    Now $$7 is the input and $$5 is the output.

    What is the operation of this function machine now?

    $$×$$2

    A

    $$−$$2

    B

    $$5

    C

    $$2

    D

    $$+$$2

    E

    $$−$$7

    F

Question 3

Look at this function machine.

         
?

$$+$$5

 $$12
         

  1. In the case above, what is the input of the function machine?

  2. If the output was changed to $$11, what would the new input of this function machine be?

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