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# Sets and Symbols

## Whole numbers, integers, rational numbers, and irrational numbers

Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.

## Subsets of Real Numbers

by CK-12 //at grade
This lesson covers how to identify the subsets of real numbers and placing a real number into one of these subsets.
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16
• PLIX

## Sets and Symbols: Number System

by CK-12 //at grade
Sets and Symbols Interactive
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• PLIX

## Size of Infinite Sets

by CK-12 //at grade
Sets and Symbols Interactive
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• PLIX

## Surjections, Injections and Bijections

by CK-12 //at grade
Sets and Symbols Interactive
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• PLIX

## Union and Intersection of Sets

by CK-12 //at grade
Sets and Symbols Interactive
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• Video

## Identifying Sets of Real Numbers

by CK-12 //at grade
Describes the sets that a real number might belong to.
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7
• 1
• Real World Application

## Egyptian Fractions

by CK-12 //at grade
Learn all about Egyptian fractions.
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• Real World Application

## Numbers, Numbers Everywhere

by CK-12 //at grade
Find out why numbers were invented.
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