A Measuring Problem

Today the triangles maths group looked carefully at a measurement problem.   This problem came from the NZMaths website... 

We made our own metre rulers using our 30cm classroom rulers to help us.  We noticed that our rulers weren't quite the right length.  We discovered that we needed to add three strips plus a bit more to get to a metre.  We talked about how 100cm is the same as 1 metre.  

Then Mrs Lee challenged us to think about how many strips we might need to make different lengths of rulers.  We had to think about what other knowledge we could use to help us to work this out.  Some of us worked out that our three times table was very useful for solving these problems.  We also worked out that we could use the answer to a previous problem to help us to work out the answer to the next problem. 

There was lots of talking about how we reached our answer for each problem and what might be an easier to way to get the answer for the next problem.