### Teaching and Group Activities for Understanding

**Day 1 Teaching**

Write a list of ingredients for a flapjack recipe. This is enough to make one tray. We need lots of flapjacks for the cake sale. What do we need to do? Together, multiply each measure by 4 by doubling twice. Repeat with a lemonade recipe, scaling it up by a factor of 10.**Group Activities**

-- Scale up recipes by 4x and 10x.

-- Scale up drawings (rectangles and triangles) by 4x and 10x.

**Day 2 Teaching**

Show a life-size outline drawing of yourself with measurements that are all multiples of 10cm. Explain that we will make a scale drawing of this picture, scaling each measurement down to 1/10 of its original length. My height is 170cm, so what will the height be on your piece of paper…?**Group Activities**

Use the in-depth problem-solving investigation ‘Follow the numbers’ from NRICH as today’s group activity.

Or, use these activities:

-- Scale down a drawing by a factor of 10.

-- Scale down Lego houses to 1/4 of their original number of bricks.