### Teaching and Group Activities for Understanding

**Day 1 Teaching**

Before the lesson, draw round the outline of two children and an adult from other classes. Bring these to lesson and display. Show a metre stick. Use this to estimate the heights of the outlines. Measure one of the outlines and model how we record this: 134cm is 1 metre and 34cm or 1.34m. Repeat with the other two outlines.**Group Activities**

-- Convert height measurements from centimetres to metres and centimetres.

-- Convert distance measurements (aeroplane heights) from metres to kilometres.

**Day 2 Teaching**

Show some pencils. Discuss what unit to use to measure them. Explain that using millimetres will give a more accurate measurement. Model accurate measuring and show on the IWB with pictures of a pencil and ruler. Write: length = 125mm. Recall that 1cm = 10mm. So, we divide 125mm by 10 to get 12.5cm. Repeat with other millimetres to centimetre conversions.**Group Activities**

Use the ‘Timeline’ in-depth problem-solving investigation below as today’s group activity.

Or, use these activities:

-- Measure lines in millimetres and convert them to centimetres.