You may also like

problem icon

Exploring Wild & Wonderful Number Patterns

EWWNP means Exploring Wild and Wonderful Number Patterns Created by Yourself! Investigate what happens if we create number patterns using some simple rules.

problem icon

I'm Eight

Find a great variety of ways of asking questions which make 8.

problem icon

Dice and Spinner Numbers

If you had any number of ordinary dice, what are the possible ways of making their totals 6? What would the product of the dice be each time?

Mystery Matrix

Stage: 2 Challenge Level: Challenge Level:2 Challenge Level:2

Have a look at this table square or matrix:



Can you see how it has been constructed?
Why are some numbers in black and some in red?
Can you explain why the red $6$ is in that particular square?
Why is there a $45$ in the bottom right-hand corner?

You will notice that the numbers $2$ - $9$ are used to generate the matrix and only one of these numbers is used twice (the $2$).

Can you fill in the matrix (table square) below?

The numbers $2$ -$12$ were used to generate it with, again, just one number used twice.

 

 

Click here for a poster of this problem.

 


The NRICH Project aims to enrich the mathematical experiences of all learners. To support this aim, members of the NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to embed rich mathematical tasks into everyday classroom practice. More information on many of our other activities can be found here.
Copyright © 1997 - 2012. University of Cambridge. All rights reserved.
NRICH is part of the family of activities in the Millennium Mathematics Project.