- Build mathematical concepts of inclusion and exclusion.
- Introduce a Venn Diagram as a visual model of classification.
- Practise using a Venn Diagram to record differences and similarities between two sets of objects.
- Foster the ability to see the relationship between classes of objects.
- Master the action of visual modelling.
- Develop the ability to use conventional symbols to represent a class of objects.
- Practise working co-operatively with others.
1. Place a variety of yeflow objects, and colourfulflowers on a tray. Some of the flowers should be yellow. Alternatively, use the picture cards provided. Place two large circles in front of the children. Explain that they are going to use the circles to help them sort the objecis into two families (the Flower Family and the yellow Family), and show the children a Flower Family symbol and place it in one of the circles. Explain that this shows us where the Flower Family goes. Repeat with a yellow Family Symbol (a yellow card) for the second circle.
Then, explain that everything in a circle must belong to the same family; only the flowers can go in the flower circle and only things that are yellow can go in the yellow circle.
2. Play "Family Sort.": Show the children flowers or yellow objects and have them place the objects in the correct circles. lf they make mistakes, prompt them by directing attention to the Family Symbol cards. After they have successfully sorted several objects, show them a yellow flower. lf they do not spontaneously ask where this should go, draw attention to the fact that it belongs to both families.
Then, discuss possible solutions to this dilemma before showing the children how to solve the problem by "making the two families overlap," i.e. overlapping the two circles to create a Venn Diagram with a space for yellow flowers between the two.
Mark this space with a Yellow Flower Family symbol as a visual prompt and continue with the game until you have sorted all the objects.
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