Well-defined sets

Sets and identifying a well-defined sets.

1. Math 7 T. Jomar E. Aquino

2. OPENING PRAYER CLEAN UP CHECKING OF ATTENDANCE

3. Write your control number

4. Write your name (Last Name, First Name, Middle Initial)

5. Write your grade and section 7 – St. John Bosco

6. Write the date: June 20, 2016 Monday

7. Activity sheet #: 2

8. Check the subject: Mathematics

9. Type of Activity: Concept Digest Drills/Exercises

10. Activity Title: Sets

11. Learning Target: a) Describe well-defined sets .

12. Reference: Patterns and Practicalities Mathematics 7, Don Bosco Press , Inc. Nivera , et, al ., pp. 5-7

13. Introduction: As we grow up, we experience groups of things such as our family, group of toys, group of playmates and eventually groups of classmates.

14. Initial Activity: Look at the objects below and answer the question that follows:

15. Direction: Answer the question below. Process Questions: How can you group the objects given? Name each groups . 2) How many groups can you form ? Make a list of it.

16. 3) Is there an object that belongs to more than one group? What are those objects ? 4) What do you call now these groups of objects you’ve formed?

17. Values Integration : 1) In what groups do you belong right now? Write at least two. 2) How are you going to describe the groups you belong? 3) As a student, in what way does these groups you mention boost your confidence?

18. Concept Digest: A group or collection of objects is called a set . Each object in a set is called a member or an element of a set.

19. Example Set A = { set of objects that can be worn } = { shirt, blouse, cap } So “shirt, blouse and cap A “ means shirt, blouse and cap are elements of A. Set B = { set of objects that are yellow } = { ball, blouse, mango } So “guava B “ means guava is not an element of B.  

20. Well-defined set is a set with an exact object or element. Example: { a subject in Grade 7} Yes it is a well-defined set, because it is clear whether a subject is taught in Grade 7. {a popular actor} No, because some people may consider an actor popular while others do not.

21. Evaluation Direction: Fill in each blank with or . Set A = {even numbers between 0 and 10} Set B = {letters of the alphabet between c and j} Set C = {months of the year ending in “ ber ”} 2 ___ Set A 6) g ___ Set B August ___ Set C 7) December___Set C b ___ Set B 8) e ___ Set B 12 ___ Set A 9) October ___ Set C January ___ Set C 10) 5 ___ Set A  

22. B . Direction: State whether the collection is a well-defined set. {a favorite fruit} {a student in your class}

23. Pass your paper

24. Closing Prayer