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?
Using small plastic bags and washers instead of envelopes and coins to do the "Coins in Envelopes" Maths Lesson Starter: https://t.co/KTLT95K9Gb The seethrough feature makes all the difference. #mathschat #mathchat #mathsCPDchat #eLearning #edchat #Binary pic.twitter.com/NpDCiQcv55
— Transum (@Transum) February 20, 2018
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This activity is suitable for students of mathematics all around the world. Use the button below to change the currency symbol used to make it more relevant to your students. You may wish to choose an unfamiliar currency to extend your students' experience. 
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Extension:
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: Transum.org/go/?Start=February5 However it would be better to assign one of the student interactive activities below. 

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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.