The children were having fun playing a counting game in the park.

The children were playing a counting game in the park.

A negative number refers to a number less than zero.

A positive number is a number greater than zero.

He used his alphanumeric skills to create a computer program.

Suro is my best friend.

Saburo is my best friend.

Kazumasa is my best friend.

A composite number, unlike a prime number, is represented by the product of two or more natural numbers.

Amicable numbers refer to a pair of natural numbers that have a special relationship in number theory, a branch of mathematics.