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.
-- 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…?
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.