The most common one is Denary system, and it is the most easy one in my opinion. Since it is exactly the same as the numbers shown. For example, 7185 in Denary system = 7(10^3) + 1(10^2) + 8(10) + 4(1) = 7185
Feature: the highest number in the string of numbers will be -1 of the specific numeral system Eg: 101101010 (Binary). Highest no.is 1, which is one less then 2, the base number.
Feature: In numeral system, the value of each digit depends on its position. It is called the place value. For example, each place value of each digit in a denary number is 10 times that of the next digit to its right.