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Lots of you sent in your solutions to this problem - unfortunately far too many to mention everyone. Most of you worked out the plant's height each day, which is a very good way of approaching the problem. Here is an example of this method from Tom who goes to Linden Primary School:So first you start with 2 centimetres.
This is very clearly recorded - well done Tom. Hannah, Grace and Ellie, who were attending Royal Institution masterclasses, sent a very similar solution. So did Oliver from Webbers School, Livvy (who didn't say which school she is from) and someone from St Joseph's School in Harrogate. Ha Young from Wesley College wrote down the same calculations in a slightly different way, showing that doubling means multiplying by two:On Friday at 9am, it was 2cm
Some pupils from Queens Crescent School also wrote down something a little different. Rather than recording multiplication, they representated the calculations as addition, like this:2+2=4
In other words, doubling a number, or multiplying it by two, is the same as adding it to itself. Very well done all of you.