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This challenge seemed to give quite a few pupils things to think about and certain decisions to be made.
Lydz and Lilz from Linton Village College said;


There are seven possible groups:
$1$. colour of doors
$2$. colour of roofs
$3$. number of storeys
$4$. amount of windows
$5$. size of the windows
$6$. placing of windows
$7$. size of chimneys

Kali from Burnside Primary of South Australia had a lovely way to show the results - well done for thinking that one out. I like that idea of presenting the answer with a kind of mind-map.



 
Lauren and Toby from Llandovery Prep School in Wales each sent in a solution like this:


There are $3$ houses with green doors.
There are $3$ houses with blue doors.
There are $3$ houses with black doors.
There are $3$ houses with $3$ storeys.
There are $4$ houses with grey rooves.
There are $5$ houses with red rooves.
There are $3$ houses with small chimneys.
There are $5$ houses with big chimneys.
There are $3$ houses with a line of symetry.
There are $3$ houses with $3$ windows.
There are $6$ houses with $5$ windows.
 
Georgia from Brewers Hill Middle School sent in the following;

colours:
$3$ green
$3$ black
$3$ blue

height:
$3$ tall houses
$6$ short houses

multicolour:
green,blue,black
$3$

roof colour:
$4$ grey roofs
$5$ red roofs

windows:
$3$ windows = $3$ houses
$5$ windows = $6$ houses

Well done all of you and if you are looking at this challenge and the solutions for the first time perhaps you could find other ways of doing the sorting?