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?
Topics: Starter  Calculator  Investigations  Mixed
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Here is an interactive version of a digital display. Click the lights to turn them on or off.
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Teacher, do your students have access to computers such as tablets, iPads or Laptops? This page was really designed for projection on a whiteboard but if you really want the students to have access to it here is a concise URL for a version of this page without the comments: Transum.org/go/?Start=October23 However it would be better to assign one of the student interactive activities below. 

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