New

New

Year 10

Foundation

# Checking and securing understanding of drawing accurate scaled diagrams

I can draw an accurate scaled diagram using a suitable choice of scale.

New

New

Year 10

Foundation

# Checking and securing understanding of drawing accurate scaled diagrams

I can draw an accurate scaled diagram using a suitable choice of scale.

## Lesson details

### Key learning points

- Given the real measurements, a suitable scale factor can be chosen.
- The scale factor should mean the scaled diagram is easy to draw accurately.
- The scale factor can be determined by the units.
- The scale factor used should always be clearly written next to the scaled diagram.

### Common misconception

Misinterpreting a scale, particularly if given with no units.

Encourage pupils to carefully convert the scale into a more useful scale. E.g. writing 1 : 20 0000 as 1 cm = 2 km

### Keywords

Scale factor - A scale factor is the multiplier between similar shapes that describes how large one shape is compared to the other.

Degree of accuracy - A degree of accuracy shows how precise a number or measurement is.

If your class need scaffolding they can be given a scale for question 3 on task B. Scales can also be tailored to suit the ability of pupils you are delivering the lesson to.

Teacher tip

### Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

## Video

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## Starter quiz

Download starter quiz

### 6 Questions

Q1.

Variables are in proportion if they have a multiplicative relationship.

different

changing

unrelated

Q2.

If 1 cm = 20 km, how many kilometres are represented by 5 cm?

Q3.

If 1 cm = 20 km, how many centimetres represent 180 km?

Q4.

The scale on a map is 1 : 300 000. The distance between two places on the map is 6 cm. What is the distance in real life in kilometres?

Q5.

The scale on a map is 1 : 400 000. The distance between two places in real life is 34 km. What is the distance between them on the map?

Q6.

The scale of a model building is 1 : 200. The height of a model block of flats is 5 cm. How tall is the block of flats in real life?

## Exit quiz

Download exit quiz

### 6 Questions

Q1.

A factor is the multiplier between similar shapes that describes how large one shape is compared to the other.

Q2.

In the scale 1 : 500, 1 cm = 5 .

Q3.

For which of the following sketches is the scale 1 : 50 appropriate?

Q4.

Which is the most appropriate scale to draw an accurate scaled drawing of this plan of a house?

1 : 3

1 : 400

1 : 500

1 : 4000

Q5.

Using the scale 1 : 500 which are the correct dimensions of the scaled drawing of this field?

0.4 cm × 0.6 cm

4 cm × 6 cm

400 cm × 600 cm

Q6.

Using the scale 1 : 500 which are the correct dimensions of the real life field?

1.3 m × 2.55 m

1.3 km × 2.55 km

13 km × 25.5 km