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Thought-Process to Discover Knowledge

Welcome to nubtrek.

Books and other education websites provide "matter-of-fact" knowledge. Instead, nubtrek provides a thought-process to discover knowledge.

In each of the topic, the outline of the thought-process, for that topic, is provided for learners and educators.

Read in the blogs more about the unique learning experience at nubtrek.continue

In this page, a simple overview of the divisibility test for `15` is provided. The procedure uses simplification by factors.



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Given a number `3xx5xx2351`. Is it divisible by `15`?

  • cannot decide without finding the result of the given multiplication
  • it is divisible by `15` as it has `3` and `5` as factors
  • it is divisible by `15` as it has `3` and `5` as factors

The answer is "it is divisible by `15` as it has `3` and `5` as factors"

Test for Divisibility by `15` : If a dividend is divisible by `3` and divisible by `5` then it is divisible by `15`

Is `2000` divisible by `15`?

  • Yes
  • No
  • No

The answer is "No". The number is divisible by `5` but not by `3`. So it is not divisible by `15`.

Is `990` divisible by `15`?

  • Yes
  • Yes
  • No

The answer is "Yes". The number is divisible by `3` and also divisible by `5`. So it is divisible by `15`.

                            
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