Teaching and Group Activities for Understanding
Day 1 Teaching
Draw an 8 × 5 rectangle on IWB squared background. Explain that its area is the amount of paper it covers and that we measure this in square units. If each square measured one centimetre by one centimetre, we would call each square one square centimetre: 1cm². Give each child cm² paper. They draw a 5cm × 4cm rectangle. What is its area? Can you draw a different rectangle with an area of 20 whole squares? Now have a go at drawing a shape with an area of 20cm² that is not a rectangle…. Compare shapes. They look different, but all have the same area.
-- Find the area of book covers by counting squares.
-- Calculate areas. Draw rectangles with a given area.
Day 2 Teaching
Remind children how to find the area of a 6 × 4 rectangle by counting the rows and multiplying. Draw a rectilinear L shape (using two rectangles 6 × 4 and 2 × 6). Discuss how we can count the squares it covers to find the area. We can sometimes use a mixture of calculation and counting. Divide the shape into two rectangles and demonstrate how to find the area by adding the two areas.
Draw a second rectilinear shape and model dividing it into rectangles to find its area.
Use the ‘Pete’s pond problem’ in-depth problem-solving investigation below as today’s group activity.
Or, use these activities:
-- Divide rectilinear shapes into rectangles to support finding the area.