Math 509 Lesson 4 Symbols And Elements Of A Set Worksheet
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9Mastery Drill 4
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4
Symbols and Elements of a Set
A set is a collection or group of similar things. Each thing is called a member or an element
of the set. Monday, Tuesday, and Sunday are all elements of Set W.
Set W = the 7 days of the week
∈
We often use symbols to show whether or not something belongs to a set. Two important
symbols are:
– “is an element of”
∉
∈
∉
– “is not an element of”
Friday
Set W
March
Set W
Friday is an element of Set W.
March is not an element of Set W.
∈
∉
Write
or
in the blanks.
Set C = A box of wax crayons
Set A = Animals with fur
1. a. A red crayon
Set C
2. a. A blue jay
Set A
b. An eraser
Set C
b. A kitten
Set A
c. A drawing pencil
Set C
c. A turtle
Set A
Set P = Prime numbers from 1 to 50
Set D = Months of the year
3. a. 49
Set P
4. a. June
Set D
b. 17
Set P
b. Saturday
Set D
c. 31
Set P
c. December
Set D
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