The decimal number system consists of digits 0 to 9 with a base of 10. Here, the first few successive places left of the decimal point represent units, tens, hundreds, and thousands. It is the number system we commonly use in real life. 45 10, 289 10, and 5781 10 are examples of decimal numbers.

Some examples of decimal numbers are:- (12) 10, (345) 10, (119) 10, (200) 10, (313.9) 10 A number system which uses digits from 0 to 9 to represent a number with base 10 is the decimal system number. The number is expressed in base-10 where each value is denoted by 0 or first nine positive integers.

For example, the number 2145 is written as: = (2 × 10 3) + (1 × 10 2) + (4 × 10 1) + (5 × 10 0) = 2000 + 100 + 40 + 5 = 2145 Suppose there are numbers further left in a base ten. In that case, the numeral is multiplied by a factor of 10, which continues forever.