# Digital Lights

Originally calculators used seven small lights (or LEDs) to form the digits 0 to 9.

1. Which light is used most?

2. Which light is used least?

3. Which letters of the alphabet could be represented using this system?

4. How many different combinations of 'on' and 'off' can these seven lights make?

## A Mathematics Lesson Starter Of The Day

Share

Topics: Starter | Calculator | Investigations | Mixed

• ijince, Guildford, England
•
• I have just discovered this website and it looks very useful. When school starts again I will probably use the Starter of the day as my home page but I would also like to pick starters appopriate to a topic. A dilema as I might run into the same one twice! Also, I know it sounds lazy but are the answers available somewhere?
• Transum,
•
• Thanks for your comments. Most starters have the answers included at the bottom of the page for those who have a Transum subscription.
• Mrs o'Hagan's 2nd yr class, Holyrood RC Sec, Glasgow
•
• E. Top, top left,middle, bottom left and bottom! and we know there are lots more!!!
• Mrs Hamilton,
•
• Letters=A,B,C,D,E,F,G,H,J,L,O,P,S & U
• Y7 Mr Heeley's Krew, Rawthorpe High, Huddersfield
•
• We enjoyed this starter, it stimulated our great minds and "lighted" up our day!
We have also recently got hooked on Fast Factors. Mr Heeley aka MC Protractor currently holds all the records. Try and beat me everybody - bring it on!!
Keep it cushtie Transum xx
• Priory School form 8r2, Shrewsbury
•
• We found Y can be done too.
• Mr Peters, Uplands Junior School
•
• My year 4 top set made A B C D E F G H I J L N O P Q R S T U V Y and Z if you allow us a little imagination and some lower case letters
• Kate Alliston And 6A, Tyrrells Primary School
•
• My class made W and M by turning the calculator on its side! Still stuck on K and X though.
• Mr Pouney, The Vyne Community School
•
• My year 10s found :
a b c d e f g h I j l n o p q r s t u y.
• Beacon Community College, Crowborough, 7XMa2
•
• The letters that cannot be represented K, M, X, V, W and T.
• Ariane, Nelson
•
• I found eleven of the letters that ARE DIFFERENT FROM DIGITS. A, C, E, F, G, H, J, L, P, U, and Y. Challenging problem, but we worked it out in the end
• R Crimmins, TORC
•
• Lower case b, c, d, e, g, h, I + j(without dot above), l, n, o, r, t, u, y
Upper case A, B, C, D, E, F, H, I, L, O, P, S, U.

How did you use this starter? Can you suggest how teachers could present or develop this resource? Do you have any comments? It is always useful to receive feedback and helps make this free resource even more useful for Maths teachers anywhere in the world.

If you don't have the time to provide feedback we'd really appreciate it if you could give this page a score! We are constantly improving and adding to these starters so it would be really helpful to know which ones are most useful. Simply click on a button below:

Excellent, I would like to see more like this
Good, achieved the results I required
Satisfactory
Didn't really capture the interest of the students
Not for me! I wouldn't use this type of activity.

This starter has scored a mean of 3.0 out of 5 based on 46 votes.

Previous Day | This starter is for 23 October | Next Day

Here is an interactive version of a digital display. Click the lights to turn them on or off.

Your access to the majority of the Transum resources continues to be free but you can help support the continued growth of the website by doing your Amazon shopping using the links on this page. Below is an Amazon search box and some items chosen and recommended by Transum Mathematics to get you started.

## Have you read Craig's book yet?

Craig Barton must surely be the voice of Mathematics teachers in the UK. His wonderful podcasts interviewing the industry experts have culminated in this wonderful book. As Craig says: "I genuinely believe I have never taught mathematics better, and my students have never learned more. I just wish I had known all of this twelve years ago..." more...

"How I wish I'd taught Maths" is an extraordinary and important book. Part guide to research, part memoir, part survival handbook, it’s a wonderfully accessible guide to the latest research on teaching mathematics, presented in a disarmingly honest and readable way. I know of no other book that presents as much usable research evidence on the dos and don’ts of mathematics teaching in such a clear and practical way. No matter how long you have been doing it, if you teach mathematics—from primary school to university—this book is for you." Dylan Wiliam, Emeritus Professor of Educational Assessment, UCL.

## Casio Classwiz Calculator

There is currently a lot of talk about this new calculator being the best in its price range for use in the Maths classroom. The new ClassWiz features a high-resolution display making it easier to view numerical formulas and symbols but it isn't a graphical calculator as such (it has the capacity to draw graphs on your smart phone or tablet, via a scannable QR code and an app).

As well as basic spreadsheet mode and an equation solving feature you also get the ability to solve quadratic, cubic or quartic polynomial inequalities and the answer is given just as it should be written down, using the correct inequality symbols!

This calculator has a high-performance processor and twice the memory of previous models ensuring speedy operation and superior computational power.more...

## Hello World

You are buying a (driverless) car. One vehicle is programmed to save as many lives as possible in a collision. Another promises to prioritize the lives of its passengers. Which do you choose?

Welcome to the age of the algorithm, the story of a not-too-distant future where machines rule supreme, making important decisions – in healthcare, transport, finance, security, what we watch, where we go even who we send to prison. So how much should we rely on them? What kind of future do we want?

Hannah Fry takes us on a tour of the good, the bad and the downright ugly of the algorithms that surround us. In Hello World she lifts the lid on their inner workings, demonstrates their power, exposes their limitations, and examines whether they really are an improvement on the humans they are replacing.

This calculator has a high-performance processor and twice the memory of previous models ensuring speedy operation and superior computational power.more...

 Teacher, do your students have access to computers?Do they have iPads or Laptops in Lessons? Whether your students each have a TabletPC, a Surface or a Mac, this activity lends itself to eLearning (Engaged Learning).

Transum.org/go/?Start=October23

Here is the URL which will take them to a related student activity.

Transum.org/go/?to=calcword

For Students:

For All: