A coffee with... IMG_0814

Published on January 16th, 2013 | by Stephanie


Laure Pradier

Position: Classroom teacher, Camberwell Primary School.

How do you introduce yourself at parties?
Hi I’m Laure as in folkLORE!!!

Do you think that mathematicians deserve the “geek” tag?
No, they deserve something far wittier.

How do you use maths in your work?
I teach it daily and endeavor to find interesting, engaging and real contexts in which to do it.
What has maths done for you lately?
It has given me great satisfaction !!!

Do you have a favourite application or theory of maths?
Yes. It is a neat result that occurs with multiplications which I was taught in primary school – in France.  My students today are still amazed at this process and love to use it!


13 X 17 = 221

First step:

1 + 3 = 4

1 + 7 = 8

Second step:

4 X 8 = 32

Third step:

3 + 2 = 5

Fourth step:

2 + 2 + 1 = 5

Notice that the result at the end of the third step and the fourth step are the same.  The digits that are added up in the fourth step are the digits that make up the original answer to the multiplication.

This is always the case, and has to do with mod nine!!

The mathematicians at AMSI did a proof.  Pretty cool hey!?




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