consecutive - numbers that are next to each other in counting order. Examples: 1 and 2 are consecutive, -5 and -6 are consecutive, 10023 and 10024 are consecutive.  4 and 6 are not consecutive.

integers - the set of numbers that includes the positive and negative values of all the whole numbers. Examples: -3, 0, 6, and -105 are all integers.  1.3 and -2.5 are not whole numbers.

rational numbers - the set of numbers that can be written as one integer divided by another. Examples: 1/2, -3/-4, 3 (3/1), and 0.2 (1/5) are all rational numbers. π and √2 are not rational numbers.

whole numbers - the set of numbers that includes 0 and the positive counting numbers. Examples: 0, 6, 103, and 42 are all whole numbers.  1.3 and -2.5 are not whole numbers.