Engage your students with this spooky mystery on upper and lower bounds. Students need to use the 12 clues to work out whether or not the witches cauldron will overflow. To do this they will have to work out upper and lower bounds and convert between ml and liters.
Mystery activities like this are a great way to develop problem solving skills. The resource can be used in a variety of ways and includes full instructions, a worked solution and ideas for support and extension.