The set of numbers 1, 2, 3, 4, ... Also called counting numbers.
Natural numbers ( counting numbers) and zero; 0, 1, 2, 3...
Natural numbers,their opposites, and zero..-2,-1,0,1,2..Etc
All numbers that can be written as quotients of integers.
Numbers that cannot be expressed as a ratio of two integers. Their decimal expansions are nonending and nonrepeating. Also not perfect squares.
Letter that represents a number
Order of operations
A Variable,a number or the product of those
A Numerical factor of a term
A pair of inequalities joined by "and" or "or"
A solution of an equation derived from an original equation that is not a solution of the original solution
a + (-a) = 0
a times 1/a = 1
a + 0=a
a times 1 = a
0 + a = a
1 times a = a