Numbers that we use to count things are called counting numbers. They are also called natural numbers. These numbers start from 1 and are infinite. That is why no one knows where to end these numbers. Zero is not a natural number since we cannot count zero. 1, 2, 3, 4, and so on are examples of counting numbers.

Those who study children’s mathematical development explain that counting involves five principles: 1. one-to-one correspondence, 2. stable number word order, 3. cardinality (the last number word in the count represents the numerosity of the set), 4. order irrelevance (objects can be counted in any order), and