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Testing for Divisibility (Without using a Calculator!)

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Test the following for divisibility by 2,3,4,5,6,8,9,and 10. (No calculator, explain your thinking).

i. 6 543 210

b. What is the smallest whole number that is divisible by 2,3,4,5,6,8,9 and 10.

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Divisibility of a large number is tested, without using a calcualtor. The results are explained in detail.

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Test the following for divisibility by 2,3,4,5,6,8,9,and 10. (No calculator, explain your thinking.

i. 6 543 210

Analysis. Obviously, since it is divisible by 10, it is divisible by 2 and 5 as well. Since 6543210=654321*10 and 654321 is an odd number, we ...

Solution provided by:
  • BSc , Wuhan Univ. China
  • MA, Shandong Univ.
Recent Feedback
  • "Your solution, looks excellent. I recognize things from previous chapters. I have seen the standard deviation formula you used to get 5.154. I do understand the Central Limit Theorem needs the sample size (n) to be greater than 30, we have 100. I do understand the sample mean(s) of the population will follow a normal distribution, and that CLT states the sample mean of population is the population (mean), we have 143.74. But when and WHY do we use the standard deviation formula where you got 5.154. WHEN & Why use standard deviation of the sample mean. I don't understand, why don't we simply use the "100" I understand that standard deviation is the square root of variance. I do understand that the variance is the square of the differences of each sample data value minus the mean. But somehow, why not use 100, why use standard deviation of sample mean? Please help explain."
  • "excellent work"
  • "Thank you so much for all of your help!!! I will be posting another assignment. Please let me know (once posted), if the credits I'm offering is enough or you ! Thanks again!"
  • "Thank you"
  • "Thank you very much for your valuable time and assistance!"
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