Home Page


WALT: calculate equivalent lengths in cm and mm

Today we will be learning how to convert between centimetres (cm) and millimetres (m). We will be using the bar model and whole part model to understand how we convert.



You will need a piece of paper and a pencil for the session as there are some activities during the PowerPoint. If you don’t have a cm ruler there will be alternatives during the lesson. Please stay in the lobby whilst completing your work. You can get instant support as well as additional modelling after the input to ensure you’re completing the work accurately.


You have a selection of three challenges to choose from today. 

  1. Mild – Convert and matching mm and cm.
  2. Spicy – Convert cm and mm to show position on a scale.
  3. Hot – Convert more accurate measurements and reasoning problem solving.


I hope you enjoy the session today. Please upload your work to Purple Mash.