To which real number sets does the number 13 belong?

Choose all answers that are correct.

A.

natural numbers

B.

whole numbers

C.

integers

D.

rational numbers

13 is a whole number, integer, natural number and rational number. Rational number because it can be written as a fraction like 13/1. It is a whole number because it doesn't have any decimals. It is an integer because an integer is a positive or negative whole number and it is a natural number because a natural number is any positive number greater than 0.