counting numbers	Also called natural numbers, the numbers 1, 2, 3, 4, ...
integers	The numbers …, -3, -2, -1, 0, 1, 2, 3…
natural numbers	Also called counting numbers, the numbers 1, 2, 3, 4, …
negative numbers	Numbers less than 0.
opposite	An opposite of a number is the number with the opposite sign, but same absolute value. For example, the opposite of 72 is -72. A number plus its opposite is always 0.
positive number	Numbers greater than 0.
set	A collection or group of things such as numbers.
whole number	The numbers 0, 1, 2, 3, …., or all natural numbers plus 0.