A number is an arithmetic value used to represent quantity. Hence, a number is a mathematical concept used to count, measure, and label. Thus, numbers form the basis of mathematics.

Number representation:

• Digit number: is a writing system for denoting numbers using digits or symbols in a logical manner. We use the digits from 0 to 9 to form all other numbers. For example, 12, 34, 2,987, etc.
• Alphabetical form of number: are the alphabetical form of numbers. As the name suggests, these are numbers written in words. For example: 1 (One), 2 (Two), 3 (Three), 15 (Fifteen), etc.

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