Examples Number Sense

Question 1

{A}, {B}, {C}= Set

Answer 1

A={1,2,3,4} B={1,2,3,4,5,6,7,8} C={2,4,6,8} D={1,2,3,4}
The numbers are in set A
Symbol: {name of the set}

Question 2

E = Element

Answer 2

3 E A

Three is an Element of set A or {A}

Question 3

/E = Not an Element

Answer 3

12 /E A

Twelve is not an element of set A or {A}

Question 4

c = A proper subset

Answer 4

A c B | C c B
A is a proper subset of B
C is a proper subset of C
Because B contains everything A and C both contains. Therefore: A and C are proper subsets of B

Question 5

/c = Not a proper subset

Answer 5

A /c D

A is not a proper subset of D

Question 6

c

— = subset

Answer 6

A c D
—

A is a subset of D because they both have the exact same things

Question 7

/c

— = not a subset

Answer 7

D /c C
—

D is not a subset of C because set D does not contains what set C has