No power and therefore no access to phones (battery's run out) so estimating in your head it is then! Four fairly simple calculations (I've called the final one a challenge as it involves more steps) that could lead to further discussion, something I have added/given the option to people in after the answers are revealed in the powerpoint. You can either do straight from the powerpoint or from the worksheet (saving the planet option available therefore).
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Great resource which will add interest to the lesson. Thank you
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