In the previous post, we have discussed about divisibility by 2. In this post, we discuss about divisibility by 3. Rule: A number is divisible by 3 if the sum of the digits is divisible by 3. The number 321 is divisible by 3 because 3 + 2 + 1 = 6 is divisible by […]

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# Monthly Archives: February 2014

## The Explanation Behind Divisibility by 2

One of the basic mathematics that we learn in middle school mathematics is divisibility. There are rules that are usually memorized. A number is divisible by 2 if it is even; a number is divisible by 3 if the sum of its digits is divisible by 3. In this series, we are going to discuss […]

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## A Detailed Proof about Congruent Angles

In this post, I want to explain in details how to prove about congruent angles. In the diagram below, and are complementary angles. Also, and are complementary angles. Now, if is congruent to , prove that is congruent to angle . Proof From the problem above, we have the following facts (given). and are complementary […]

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