1-3 Union and Intersection of Sets
CCSS Objectives

W-SM: Symbolic Mathematics: Understand set notation including the union and
intersection of sets and Venn diagrams
Vocabulary

union, universe, universal set, Venn diagram, intersection, complement, disjoint sets,
compound inequality, intersection
Essential Question(s): How can you use mathematical symbols to describe sets? How can
you describe relationships among sets and elements of sets?
Questions
Notes and Examples
1. Write “the union of sets A and B” using the following
notation:
a. set-builder notation
b. symbolized notation
2. Write “the intersection of sets A and B” using the following
notation:
a. set-builder notation
b. symbolized notation
3. Write “the complement of set A” using the following notation:
c. set-builder notation
d. symbolized notation
4. Refer to the diagram to complete parts a thru d.
A = {1, 3, 5}, B = {3, 6}, C ={2, 4}
a. C’
b. A ∪ B
c. A ∩ B
d. A ∩ C
e. (A ∩ B)’
f. (A ∪ B) ∪ C
5. Use the set of real numbers as the replacement set to find the
solution set for 𝑥 ≥ −1 and 𝑥 < 4.
6. Use the set of real numbers as the replacement set to find the
solution set for 𝑥 ≥ 4 or 𝑥 < −1.
Summary: