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2. Divisibility rule - Wikipedia

   en.wikipedia.org/wiki/Divisibility_rule

   We also have the rule that 10 x + y is divisible iff x + 4 y is divisible by 13. For example, to test the divisibility of 1761 by 13 we can reduce this to the divisibility of 461 by the first rule. Using the second rule, this reduces to the divisibility of 50, and doing that again yields 5. So, 1761 is not divisible by 13.

3. Digital root - Wikipedia

   en.wikipedia.org/wiki/Digital_root

   In base 10, this is simplest for =,,, where higher digits except for the unit digit vanish (since 2 and 5 divide powers of 10), which corresponds to the familiar fact that the divisibility of a decimal number with respect to 2, 5, and 10 can be checked by the last digit.

4. Parity (mathematics) - Wikipedia

   en.wikipedia.org/wiki/Parity_(mathematics)

   The following laws can be verified using the properties of divisibility. They are a special case of rules in modular arithmetic, and are commonly used to check if an equality is likely to be correct by testing the parity of each side. As with ordinary arithmetic, multiplication and addition are commutative and associative in modulo 2 arithmetic ...

5. Division (mathematics) - Wikipedia

   en.wikipedia.org/wiki/Division_(mathematics)

   Division is one of the four basic operations of arithmetic.The other operations are addition, subtraction, and multiplication.What is being divided is called the dividend, which is divided by the divisor, and the result is called the quotient.

6. Talk:Divisibility rule - Wikipedia

   en.wikipedia.org/wiki/Talk:Divisibility_rule

   Divisibility rule was a Mathematics good articles nominee, but did not meet the good article criteria at the time. There may be suggestions below for improving the article. Once these issues have been addressed, the article can be renominated. Editors may also seek a reassessment of the decision if they believe there was a mistake.

7. Divisibility (ring theory) - Wikipedia

   en.wikipedia.org/wiki/Divisibility_(ring_theory)

   Let R be a ring, [a] and let a and b be elements of R.If there exists an element x in R with ax = b, one says that a is a left divisor of b and that b is a right multiple of a. [1] ...