Our newest math "magic" trick has to do with a very special number - 6,174. It is known as Kaprekar's constant, after the mathematician D.R. Kaprekar. What makes this number so mysterious?
Is this answer 6,174? No? Well, let's do it again, because it WILL be!
Take your answer and do the same - make largest number, smallest number, and subtract smallest from biggest. Keep doing this until you get 6,174. You always will, in no more than 7 steps.
We will continue working on this at school, and it would be great to have your children show you at home as well. The magic for me is that it is a great way to give our students practice with subtraction with and without renaming!