ACT Math Flashcards

Natural (N): Counting numbers \\(\\{1, 2, 3, ...\\}\\)
Whole (W): Natural numbers including zero \\(\\{0, 1, 2, 3, ...\\}\\)
Integers (Z): Whole numbers and their negatives \\(\\{..., -2, -1, 0, 1, 2, ...\\}\\)
Rational (Q): Numbers of the form \\(\\frac{a}{b}\\) where \\(a,b\\) are integers, \\(b \\neq 0\\) (terminating or repeating decimals).
Irrational (I): Non-repeating, infinite decimals (e.g., \\(\\pi, \\sqrt{2}\\)).
Reals (R): All Rational + Irrational numbers.
Complex: \\(a + bi\\) where \\(a,b\\) are real and \\(i = \\sqrt{-1}\\).

55 Essential Concepts, Formulas, and Definitions to Memorize

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