What is Number Ninja?

The ultimate 'Number Ninja' badge. Nobody has achieved this level yet.
The ultimate ‘Number Ninja’ badge. Nobody has achieved this level yet.

Number Ninja is essentially an assessment system for maths that uses badges to reward children for making progress. It’s for children in the Primary age range from 5-11 years of age.

I had become frustrated with some of the maths assessment we were using at my school. I felt they were either too slow or too lenient and they didn’t reflect what I consider to be the golden triangle of maths achievement – understanding, pace and accuracy. For example we were using a ‘99 club’ – several iterations of this exist. It was a good system, demanding recall of multiplication facts and division facts. Each class would do the test once a term and the children would be rewarded with a certificate in an end-of-term assembly, with a class prize going to the class that had obtained the most certificates. However the one we were using allowed 10 minutes for each test, which was just too long for my liking.

We also use a system called Incerts which calculates a national curriculum level for each child based on the number of statements ticked. I find this system both convenient and accurate, but in my opinion the current National Curriculum under-rewards children for mental mathematics skills.

A second problem was inconsistency across the school. While we had two main whole school systems, teachers were using a range of assessment systems within their own classes that didn’t continue beyond that year group. For example some people were using the excellent mental maths assessment developed by Wigan LEA some years ago (get it while you can – this website is no longer supported). Other people used their own times table systems that they had borrowed from other places or created themselves.

What I wanted to do was create a wider system that demanded more from the children in terms of pace but still maintained a whole school rewards system in a big termly assembly – this is useful to keep a high profile for mathematics.

So I did 4 things:

  1. I kept Incerts and 99 Club – there’s no point throwing away good stuff if it’s already working.
  2. I developed a new mental maths assessment system called ‘Grid Club’. This is much more pacey than 99 Club.
  3. I introduced Khan Academy. While I’m not overly impressed with the instructional videos on Khan Academy, I do really like the assessment system that goes alongside it.
  4. I created a spreadsheet to collect all the scores from the different systems and calculate an overall Number Ninja score – this is what I use to award the badges.

Here’s an example of what the Number Ninja spreadsheet looks like. It’s from the Year 3 class. Teachers enter the numbers in the coloured columns and the number on the far right is what the spreadsheet generates. It is colour coded to tell you what ‘Number Ninja’ level the child is on.

Number Ninja spreadsheet
Here’s what the spreadsheet looks like

Any questions or suggestions about Number Ninja – I would be grateful to hear them!

The Mental Maths SATs Lady – reflections by Year 6 children.


At Teachmeet BETT 2011 I tweeted that my year 6 had created various renditions of the SATs Lady using Audacity. I also realised that I had not at any point shared their musical productions. The year 6 children that made these recordings have left now (the project happened in Summer 2010), but maybe their creativity can serve to inspire future generations of Year 6 SATs musicians.

(Apologies – these files haven’t copied across properly from Posterous).