Dr. Kat Math Practice

Number Families

Lesson Page 1, Section 2

What you'll work on

Classify numbers into Natural (N), Integer (Z), and Rational (Q) sets and understand how the families nest inside each other.

Big Idea for this lesson

$Three painted Russian matryoshka nesting dolls of increasing size, shown slightly open so each smaller doll is visible inside the next — representing N ⊂ Z ⊂ Q.$

Numbers live in families, and some families fit inside other families. Natural numbers are inside integers. Integers are inside rational numbers. They are like nesting dolls — each set fits inside the next one: N ⊂ Z ⊂ Q.

7 questions · pace yourself · explanations on every answer

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