Cookies on Helen Arkell

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we'll assume that you are happy to receive all cookies on the Helen Arkell website. However, if you would like to, you can change your cookie settings at any time.




(Inc. 20% VAT)

The Numdrum was invented by John Harrison to help children struggling with the basics of understanding numbers, adding and subtraction. It is a simple but revolutionary development, which through its design addresses the serious inadequacies of some present teaching aids, most notably the number square.

The numdrum is a number line extending from 0-139, which has been given a decimal structure by winding it round a tube in helical form in such a way that there are 10 numbers per turn. This makes the number line continuous, unlike a 100 number square. The surface is dry-wipe and it is accompanied by a manoeuverable plastic sleeve and an A4 sheet of suggested uses and puzzles to solve.

Just as important, children find it fun and interesting to use!

Website by Dewsign  |  UI Design by Sam Barclay

Registered Charity in England and Wales (1064646) A company limited by guarantee, registered in England and Wales company number 3432423.