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10 cards from this deck
{1, 2, 3, 4, ...} - counting numbers
{0, 1, 2, 3, 4, ...} - natural numbers + zero
{..., -3, -2, -1, 0, 1, 2, 3, ...} - all whole numbers
Number as ab\frac{a}{b}ba, aaa, bbb integers, b≠0b \neq 0b=0
Cannot be written as fraction; decimal doesn't terminate/repeat
nthn^{th}nth root that can't simplify to rational (e.g., 2\sqrt{2}2)
Algebraic expression with exactly two terms
(x+y)(x2−xy+y2)(x + y)(x^2 - xy + y^2)(x+y)(x2−xy+y2)
(x−y)(x2+xy+y2)(x - y)(x^2 + xy + y^2)(x−y)(x2+xy+y2)
Only factors cancel, never individual terms
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