Editing Divisibility rule (section)

====Case where only the last digit(s) matter====

This applies to divisors that are a factor of a power of 10. This is because sufficiently high powers of the base are multiples of the divisor, and can be eliminated.

For example, in base 10, the factors of 10<sup>1</sup> include 2, 5, and 10. Therefore, divisibility by 2, 5, and 10 only depend on whether the last 1 digit is divisible by those divisors. The factors of 10<sup>2</sup> include 4 and 25, and divisibility by those only depend on the last 2 digits.