Number Sets Flashcards

1
Q

Are all natural numbers also integers?

A

Yes. Natural numbers (N) are a “subset” of integers (Z).

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2
Q

What are rational numbers?

A

They’re numbers that could be written as a fraction.

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3
Q

Is 0 (zero) a positive number?

A

Nope. Zero is neither positive nor negative.

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4
Q

What are natural numbers?

A

Numbers you can count on your fingers.

{0, 1, 2, 3, …..}

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5
Q

What are irrational numbers?

A

Numbers that can’t be written as a fraction. You’ll recognize these numbers in three ways:

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6
Q

What are integers?

A

They’re whole numbers (no decimals, no fractions) but integers also include zero and negative numbers.

{…, -2, -1, 0, 1, 2, …}

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7
Q

What does this symbol mean?

A

Rational numbers: anything that could be written as a fraction.

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8
Q

Are all integers also rational numbers?

A

Yes. Integers (Z) are a subset of rational numbers (Q).

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9
Q

What does this symbol mean?

A

Natural numbers: {0, 1, 2, 3, …}

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10
Q

What does this symbol mean?

A

Integers: {…, -2, -1, 0, -1, 2, …}

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11
Q

What are real numbers?

A

Literally all of the numbers you’ve ever heard of.

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12
Q

Are all natural numbers also rational numbers?

A

Yes. Natural numbers (N) are a “subset” or rational numbers (Q).

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