|
||||||||||||||||
|
|
||||||||||||||||
|
This sequence is quite easy to work out, and it produces some interesting patterns. Get the children to carry out the process, looking for patterns in their work throughout.
| 1) Think of a two-digit number | 28 |
| 2) Reverse the digits | 82 |
| 3) Take the smaller number from the larger number | 82 - 28 = 54 |
| 4) Using this answer, goto step 2 and repeat the process a number of times | 54
- 45 = 9 90 - 09 = 81 81 - 18 = 63... |
The children should soon recognise the links with the nine times table. This could then be used as a starting point for patterns within the nine times table.
Ask the children if there are any numbers for which Kaprekar's sequence does not work (numbers with two digits which are the same - 11, 22, 33 etc.). Why do they think this is the case?
Ask them to test the sequence using three digit numbers. Does the same pattern still result?
Teaching Ideas - Providing
free lesson ideas, resources and activities since 1998. All Content © Mark
Warner / Teaching
Ideas 1998-2009 |
||||||||||||
 |
|
Join
the Mailing List Enter your email address to receive updates via email. |
Teaching
Ideas is kindly hosted by |
|||||||||
Display
Photos / 
Teaching
Forum / 
Teaching
News / 
Welcome
to the Web / 
Ideas
to Inspire / 
Teachr / 
MrWarner.com
