Generalising the divisibility tests of 9 and 11
Ramachandran, A. (2019) Generalising the divisibility tests of 9 and 11. At Right Angles (5). pp. 32-33. ISSN 2582-1873
|
Text
- Published Version
Download (633kB) | Preview |
Abstract
Divisibility tests for 9 and 11 are generally taken up at upper primary school level. The test for 9 seems to remain in people’s consciousness long after they leave school and move on to other things. The assertion that the sum of the digits of any multiple of 9 is itself a multiple of 9 seems to give a mystical aura to the number 9. The test for 11 is more involved and does not seem to be retained as well, but other patterns in the multiples and powers of 11 are widely appreciated.
Item Type: | Articles in APF Magazines | ||
---|---|---|---|
Authors: | Ramachandran, A. | ||
Document Language: |
|
||
Uncontrolled Keywords: | Divisibility tests, number bases, algebraic factorisation. | ||
Subjects: | Natural Sciences > Mathematics | ||
Divisions: | Azim Premji University > University Publications > At Right Angles | ||
Full Text Status: | Public | ||
URI: | http://publications.azimpremjiuniversity.edu.in/id/eprint/2131 | ||
Publisher URL: |
Actions (login required)
![]() |
View Item |
Altmetric
CORE (COnnecting REpositories)