1. SETS: Unions & Intersections

2. What are these?
Are there 2 groups here?

3. There are 2 SETS of objects
Red objects: Fruits:

4. How do we place them into a Venn Diagram?
Red objects: Fruits:

5. We will be diagramming SETS OF NUMBERS using Venn Diagrams
Today:
We will be diagramming SETS OF NUMBERS using Venn Diagrams

6. TEAMS
You will be working with your teams to complete the Venn diagramming worksheet! 10 minutes…

7. What is a “SET”?
A “collection”

8. Sets are collections of what?,
Sets are collections of what?
B={ }
“ELEMENTS” ∈
Symbols: =“is an element of” ∉
=“is NOT an element of”

9. How would you write: “7 is an element of B” in set notation?∈
7 B

10. What is a SUBSET?
Latin: “a Part of” ⊆
Symbol: =“is a subset of”

11. What is a SUBSET in set B?
B={ }

12. How would we write “3 5 and 7 are a subset of B”?⊆
{3 5 7} B

13. We can perform operations on sets like we can perform operations on numbers
(And you already know 2 of them! )

14. What did you find for #1 on your worksheet?

15. What does the word “union” mean?
What does it mean when we find the Union of two sets A and B?
We are finding the set that contains all elements of both sets, including the shared elements—only recorded once.

16. Write this in front of your recorded answer in #1
#2. UNION
Symbol: U
How would we write the
“union of set A and B”?
AUB={ }
Write this in front of your recorded answer in #1

17. What is the second thing you were asked to find on your worksheet?

18. What does the word “intersection” mean?
What does it mean when we find the Intersection of two sets A and B?
We are finding the set that contains all elements of A that ALSO belong to B

19. A∩B={13 17} #2. INTERSECTION Symbol: ∩
How would we write the “intersection of set A and B”?
A∩B={13 17}
Write this in front of your recorded answer in #2

20. #1 on your NOTES Handout:
TAKE A LOOK….
C={ }
P={ }
#1 on your NOTES Handout:
What are we asked to find?

21. #2 on your NOTES Handout:
TAKE A LOOK….
C={ }
P={ }
#2 on your NOTES Handout:
What are we asked to find?

22. THINK…..
What is the UNION and INTERSECTION of sets A and B?
A={ }
B={ }
What is a SUBSET of A?
Work in your TEAMS to answer the questions,
And use the right SET NOTATION!

23. THANK YOU!