A numeral system is a writing system for expressing numbers; that is, a mathematical notation for representing numbers of a given set, using digits or other symbols in a consistent manner. The same sequence of symbols may represent different numbers in different numeral systems. The number system or the numeral system is the system of naming or representing numbers. There are various types of number systems in maths, like binary, decimal, etc. This lesson covers the entire concepts of the numeral system with their types, conversions and questions. The Number System is based on Consolidating the sense of numbers, i.e. uniting or combining the numbers. Estimating numbers, Natural numbers and Whole numbers, International system, Comparing Whole numbers are some topics covered in this chapter.