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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

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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## Subsets of Real Numbers

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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## Classify Real Numbers

Learn to classify real numbers.
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## Classifying Real Numbers

Learn to classify real numbers.
MEMORY METER
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