Fifteen pennies are placed in four envelopes and the envelopes are sealed. It is possible to pay someone any amount from 1p to 15p by giving them one or more envelopes. How were the pennies distributed between the envelopes?
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What if there were 31 pennies and 5 envelopes?
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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:
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Do you need a visual aid to help you explain the binary system? Click below.
Are the coin values used today the most efficient choices? Listen to this excerpt from the 'No Such Thing As A Fish' podcast and investigate the claims made about 1p, 3p, 11p, and 37p coins.