• Curriculum

## Draw, compose and decompose shapes

Unit 4 – 2 weeks

The PowerPoint file contains slides you can use in the classroom to support each of the learning outcomes for this unit, listed below.

Geometry topics are not covered by the NCETM Primary Mastery Professional Development materials. Therefore, some slides for this unit have been additionally created to provide the high-level overview to address each learning outcome. However, they do not provide the level of detail seen in other units, so teachers will need to supplement slides with other high quality materials available to them. You should also refer to the national curriculum to ensure coverage. There are also links to the ready-to-progress criteria detailed in the DfE Primary Mathematics Guidance 2020.

### Learning outcomes

 1 Use knowledge of shape properties to draw, sketch and identify shapes 2 The same 3D shape can be composed from different 2D nets 3 When a 2D shape is decomposed and the parts rearranged, the area remains the same. The area of a compound shape is therefore equal to the total of the areas of the constituent parts 4 Any parallelogram can be decomposed and the parts rearranged to form a rectangular parallelogram 5 Two congruent triangles can be composed to form a parallelogram 6 Shapes with the same area can have different perimeters. Shapes with the same perimeters can have different areas 7 We can use the relationship between area and side length, and perimeter and side length, to reason about measurements of shapes, including compound shapes

• Primary
• KS2
• Year 6