**A context for developing number concepts **

In discussing the principles of measurement, we should stress the central importance of measurement experiences as a context for developing number concepts. Throughout this course I have used measurement problems and situations to reinforce ideas such as place value, the various structures for the four operations and calculations with decimals.

For example, the key idea of comparison in understanding subtraction is best experienced in practical activities comparing heights, masses, capacities and time; and the key structure of division as the inverse of multiplication can be connected with finding how many small containers can be filled from a large container.