Decimal numerical system is defined with its basis 10 and decimal positioning from right to left, and it consists of digits 0,1,2,3,4,5,6,7,8,9. This means that the rightmost digit is multiplied by 1 in total sum, next digit to it is multiplied by 10, next one by 100, etc. Example: Operations of addition, subtraction, division and multiplication in decimal numerical system are well known, so we will not detail these.