Ron Gwairown always writes numbers down back to front. At school, he was once asked to do the following calculation:
14 x 82
In his exercise book Ron wrote down:
41 x 28
1. What answer did he get?
2. What answer should he have got?
3. Investigate other pairs of calculations of this type? What can you discover?
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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:
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.