This is a simple Smart Notebook file that looks at finding the difference when comparing lengths. It can be edited to suit the needs of your class but is a simple layout and a good starting point to your lesson.
It allows pupils to measure objects using the board as a visual stimulus and using an interactive ruler.
The Notebook also shows the pupils lesson activity in which they must measure and compare objects within the classroom and record the results on a table (CM'S). They will also be required to find the difference which would have been covered earlier in the presentation.