Classroom Observation in Mathematics 7:Introduction to Sets

Mathematics Grade 7: Introduction to Sets

1. Mathe matics Grade 7 SETS: AN INTRODUCTION MICHAEL B. JORDAN

2. Preliminaries Prayer Energizer Attendance

3. Objectives 1. Describe and illustrate well-defined sets Subsets Universal set The null set 2. Use Venn Diagrams to represent sets and subsets

4. Activity Group the objects as you see fit and label each group

5. 2 8 9

6. Trees Caps Numbers 2 8 9

7. Green Objects Red objects 2 8 9 Yellow Objects

8. The groups are called sets for as long as the objects in the group share a characteristic and are thus, well-defined.

9. Important Terms to Remember SET is a well-defined group of objects, called elements that share a common characteristic. Example: set of days in a week set of pink flowers set of grade seven learners

10. Important Terms to Remember The set F is a SUBSET of set A if all elements of F are also elements of A. Example: Set A = 1 2 3 4 5 Set F = 2 4 set F is a SUBSET of set A

11. Important Terms to Remember UNIVERSAL SET is the set that contains all objects under consideration.

12. Important Terms to Remember NULL SET is an empty set. The null set is a subset of any set. Example: set of green stars set of cars with no wheels

13. Important Terms to Remember CARDINALITY OF A SET is the number of elements contained in a set. Example: Set of Trees Cardinality is 3 Set of Days in a Week Cardinality is 7 Set A = 1 2 3 4 5 Cardinality is 5 Set of green stars Cardinality is 0

14. Draw 3 examples of well-defined sets. Name two subsets of the numbers from 1 to 10. List all the possible subsets of set B = {1, 2, 3, 4}

15. THANK YOU!