Sets/ Subsets

Natural numbers are the set of positive integers starting from 1 (1, 2, 3, ...). They do not include zero.

False, natural numbers do not include zero.

Whole numbers are the set of non-negative integers including zero (0, 1, 2, 3, ...).

Integers are the set of whole numbers that can be positive, negative, or zero (..., -3, -2, -1, 0, 1, 2, 3, ...).

A rational number is any number that can be expressed as a fraction a/b, where a and b are integers and b is not zero.

An irrational number is a number that cannot be expressed as a simple fraction; it is a non-repeating, non-terminating decimal.

The square root of 3 is approximately between 1 and 2.

False, -1 is not a whole number.

True, -1 is an integer.

True, -1 can be expressed as -1/1.