I use this with elementary school since the 'let's Try' textbooks use stationery as theme for 'how many do you have?' and 'I have a pen'.
Generally use it for speak and race activities. Students make groups and pick their order. Each group gets one picture. Both teachers should have a copy of the answer sheet. A teacher asks the first question 'How many rulers do you have?', they find the answer and one member comes to a teacher with the answer. If its correct tell them the next question. They should return to their group, say the question in English to their teammates and a new student will bring the answer to a teacher. Continue for about 12 questions.
I've added a powerpoint for introducing the key vocabulary. I use it to play the 'keyword game' also called the 'eraser get game'. If you click on the pictures a star appears. The picture with the star is the keyword. I broke it down into two levels so its not too much vocabulary at once.
Also added 'Oh No not 20' for a warm up to practice the numbers.
I would probably use 'OH No not 20' and the keyword game the week before doing this poster.
This can also be used for 'there is/there are' lessons.