Drawing The aim of this lesson is to practice spatial awareness. It starts by teaching visualisation of numbers, since this sort of skill is required when working with dimensions. It goes on to get the students to identify different projections of shapes, and then moves onto labelling diagrams with the correct dimensions for that projection.

why is drawing important? communication!

Drawing

? ? ? Drawing Can you think what might help? How big is it? This man is puzzled when looking at it. How big is it? What is it supposed to look like? Ask the students what information on the drawing may help him. – dimensions and materials Can you think what might help?

Ways to Labelling your design A materials list and key is always important. Dimensions are also important. 3. Direct labels are good, but only with non-complex structures. 4. With complicated designs, scale is better. Drawings done ‘to scale’ are smaller than the real thing, but have the correct proportions. Therefore you can measure straight off the drawing and know a dimension.

Drawing 1:10 SCALE Labels Key Scale = iron sheet = wire mesh 2.4 m

Different Views of the drawing You must be able to draw different views of your structure. Allow people to understand what the shape looks like, and also read measurements of surfaces easily. It is also useful for calculating the amount of materials required.

Drawing what is useful about drawing different views? calculate area – work out how much material required

Drawing Scale It is a good idea to decide scale before you start. As an example, let us say the largest dimension on the design is 10m. You want the drawing to fill the page, so select an easy number that will fit on the page, for example 20cm. You can now say that 20cm on the drawing represents 10m in real life, or 20cm represents 1000cm in real life. You always try and write scale in its simplest, smallest form, so this scale would be 1:50, or 1cm on the drawing represents 50cm in real life.

For example chicken hut Drawing Scale For example chicken hut SCALE

How to visualise dimensions 7 - 3 = 4

How to visualise Subtraction 200 bricks 700 bricks 700 - 500 = 200 500 bricks

How to visualise Subtraction 100 bricks 700 bricks 600 bricks 30 bricks 570 bricks 30 + 100 = 130 700 - 570 = 130

How to visualise Subtraction 200 bricks 500 bricks 300 bricks 10 bricks 1 brick 290 bricks 289 bricks 1 + 10 +200 = 211 500 - 289 = 211

Drawing

Drawing

Drawing

Drawing

Drawing 10 cm 8 cm 20 cm 10 cm 8 cm 15 cm 15 cm 15 cm 20 cm 15 cm

Drawing 1.6 m 1.5 m 2.1 m 2.5 m 1.5 m 3 m 1.5 m 1.6 m 2.1 m 2.5 m 0.5 m 1.6 m 1.5 m 2.5 m 1.5 m 2 m 1.5 m 1.5 m