Just doing the division is simpler, in most cases.
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You can always check on the divisibility of a number by dividing it into another number. But if you know the divisibility rules, you can get that information easier and faster.
Divisibility rules help you find the factors of a number. Once you've found the factors for two or more numbers, you can find what they have in common. Take 231 and 321. If you know the divisibility rules, you know that they are both divisible by 3, so 3 is a common factor.
Divide by two and five. 1, 2, 4, 5, 10, 20
Airline - 2004 Rules Are Rules 2-16 was released on: USA: 18 October 2004
All Factors of 64:1, 2, 4, 8, 16, 32, 64