Which term is used to describe a number expressed using the base 10 system?

The term used to describe a number expressed using the base 10 system is "decimal." The decimal system is one of the most widely used number systems and consists of ten digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9. Each digit's position in a decimal number represents a power of 10, which is foundational in everyday counting and arithmetic.

In contrast, the hexadecimal system uses base 16 and includes digits 0-9 as well as letters A-F, representing values 10-15. The binary system operates on base 2, using only the digits 0 and 1, commonly found in computing. The octal system, on the other hand, is base 8, utilizing the digits 0-7. Each of these systems serves specific purposes in fields such as computing and mathematics, but when referring to base 10, "decimal" is the correct term.