Digital Lights

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


Topics: Starter | Calculator | Investigations | Mixed

  • ijince, Guildford, England
  • Monday, August 20, 2007
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  • Mrs o'Hagan's 2nd yr class, Holyrood RC Sec, Glasgow
  • Thursday, June 19, 2008
  • "E. Top, top left,middle, bottom left and bottom! and we know there are lots more!!!"
  • Mrs Hamilton,
  • Friday, June 20, 2008
  • "Letters=A,B,C,D,E,F,G,H,J,L,O,P,S & U"
  • Y7 Mr Heeley's Krew, Rawthorpe High, Huddersfield
  • Friday, July 4, 2008
  • "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!!
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  • Priory School form 8r2, Shrewsbury
  • Friday, July 4, 2008
  • "We found Y can be done too."
  • Mr Peters, Uplands Junior School
  • Friday, July 4, 2008
  • "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
  • Thursday, October 8, 2009
  • "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
  • Wednesday, July 7, 2010
  • "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
  • Monday, July 4, 2011
  • "The letters that cannot be represented K, M, X, V, W and T."
  • Ariane, Nelson
  • Wednesday, July 3, 2013
  • "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
  • Thursday, July 11, 2013
  • "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."

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Answers

1. The lower right light is 'on' for 9 of the digits 0-9

2. The lower left light is only 'on' for 4 of the digits 0-9

3. Here's a start:

A could be represented with all lights on except for the bottom light;

B could be all lights on (same as the digit 8);

C could be top, upper left, lower left and bottom;

(If anyone manages to complete this list please share your answers here)

4. There are 27 or 128 different combinations.

 




Laptops In Lessons

Teacher, do your students have access to computers?
Do they have Laptops in Lessons or iPads?

Whether your students each have a TabletPC, a Surface or a Mac, this activity lends itself to eLearning (Engaged Learning).

Laptops In Lessons

Here is the URL for a concise version of this page without comments or answers.

Transum.org/go/?Start=October23

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

Transum.org/go/?to=CalcWord

 

 


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