Maybe you immediately recognize that 120 isĪn even number. Is 2 divisible into 120? So there's 120 equalsĢ times something? Well, when you look here, That's its actual smallestįactor, and its largest factor is 120. So this is going to be ourįactors list over here. It, find all of the whole numbers that 120 isĭivisible by 1. Just remember that even though divisibility rules don't seem helpful right now, there is a point to learning them and they will be useful in the future. The divisibility rules were complied by and if you want the the proof of them you can check them out at this link: ĭivisibility by 13: The sum of four times the units digits with the number formed by the rest of the digits must be divisible by (this process can be repeated for many times until we arrive at a sufficiently small number).ĭivisibility by 25: The number formed by the tens and units digit of the number must be divisible by ĭivisibility by 12: The number should be divisible by both and. ĭivisibility by 10: The number should have as the units digit.ĭivisibility by 11: The absolute difference between the sum of alternate pairs of digits must be divisible by. ĭivisibility by 9: The sum of digits of the number must be divisible by. ĭivisibility by 7: The absolute difference between twice the units digit and the number formed by the rest of the digits must be divisible by (this process can be repeated for many times until we arrive at a sufficiently small number).ĭivisibility by 8: The number formed by the hundreds, tens and units digit of the number must be divisible by. ĭivisibility by 5: The number should have or as the units digit.ĭivisibility by 6: The number should be divisible by both and. ĭivisibility by 4: The number formed by the tens and units digit of the number must be divisible by.
ĭivisibility by 2: The number should have or as the units digit.ĭivisibility by 3: The sum of digits of the number must be divisible by. I can promise you that if you properly learn divisibility to rules it will be extremely helpful to you as you perform more complex math.įor now I think you should remember that:ĭivisibility by 1: Every number is divisible by. I agree that right now the divisibility test seems unnecessarily complicated right now, but I can promise you that it will become extremely important with more complicated math such as simplifying square roots, prime factorization, gcf, quadratic factoring and many other fields (as prime factorization, simplifying square roots, gcf and quadratic factoring are also necessary for other topics).Īlso for the simplicity of it, you just have to memorize the ways divisibility rules (there may be a simpler way but I haven't heard of one), and if you keep practicing eventually it becomes natural and simple to perform.
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