Number Sets Flashcards
Are all natural numbers also integers?
Yes. Natural numbers (N) are a “subset” of integers (Z).
What are rational numbers?
They’re numbers that could be written as a fraction.
Is 0 (zero) a positive number?
Nope. Zero is neither positive nor negative.
What are natural numbers?
Numbers you can count on your fingers.
{0, 1, 2, 3, …..}
What are irrational numbers?
Numbers that can’t be written as a fraction. You’ll recognize these numbers in three ways:
What are integers?
They’re whole numbers (no decimals, no fractions) but integers also include zero and negative numbers.
{…, -2, -1, 0, 1, 2, …}
What does this symbol mean?
Rational numbers: anything that could be written as a fraction.
Are all integers also rational numbers?
Yes. Integers (Z) are a subset of rational numbers (Q).
What does this symbol mean?
Natural numbers: {0, 1, 2, 3, …}
What does this symbol mean?
Integers: {…, -2, -1, 0, -1, 2, …}
What are real numbers?
Literally all of the numbers you’ve ever heard of.
Are all natural numbers also rational numbers?
Yes. Natural numbers (N) are a “subset” or rational numbers (Q).
