1. Welcome

2. Converting – Metric units
Length
Weight
Capacity
10 mm = 1cm
1000 mg = 1g
100 cl = 1 litre
100 cm = 1m
1000 g = 1 kg
1000 ml = 1 litre
1000 mm = 1m
1000 kg – 1 tonne
1000 cm3 = 1 litre
1000 m = 1 km
1000 litre – 1m3

3. When converting between measurements, we multiply and divide in multiples of 10s, 100s or 1000s…

4. Convert the following…
2000mm in to m
1200cm in to mm
80000cm to km
457ml to l
4.5l to ml
5.6kg to g
25g to kg
0.75kg to g

5. What we are doing this week…
Converting measurements
Using ratio
Using measurement and ratio to complete scale drawings

6. What is ratio? Ratio is a way of comparing amounts of something.
It shows how much bigger one thing is than another.

7. How is ratio written?
4 : 1
This ratio has 5 parts altogether as = 5.
This will be important a bit later on!

11. When writing ratio, they must first be converted to the same unit.
1mm : 5cm (b) £3.50 : 70p
15 mins : hour (d) 2mm : 10mm
(e) 5.2 litres : 300cl
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12. What is scale?
Architects make models of buildings. Models are 3-D representations of objects.
People use maps so as not to get lost. Maps are flat 2-D representations of a plan view of an area.
When we make a scale copy of an object, the original and the copy have the same proportions.

13. Some general rules
All the “real” measurement’s are multiplied or divided by the scale factor Are you going from scale drawing or from life size? Bigger or smaller X
Smaller
Model/Plan
Bigger
Life size ÷

14. Ratio and models A model of a dinosaur has a scale of 1:12
This means that for every 1cm of the model the real life size is 12cm
The head on the dinosaur model is 8 cm in length.
How long is the head of the real dinosaur?

15. The model of the dinosaur is 1:12
This means that for every 1 cm of the model the real skeleton measures 12cm 8cm on the model = 8 x 12 in real life.
8 x 12 = 96
The head of the real dinosaur is 96 cms

16. Test yourself
Below are two measurements of a car.
130cm
4.4m
A model is made using a scale of 1:10
What is the length of the model?
What is the height of the model?

17. Drawing to Scale
A worked example
CLD 2014

18. Next
The scenario
This task is about planning part of a kitchen. You work for a kitchen design company. A customer wants some new kitchen units along one wall. You have to make a scale drawing for the customer.
CLD 2014

19. The customer’s kitchen wall is 3.5m wide and 2.75m high.
You will draw a scale diagram where 4 centimetres represents 1 metre.
Work out the scaled measurements for the plan.
Next
CLD 2014

20. Draw a scale diagram of the wall
1Metre
14cm:3.5m
11cm:2.75m
Next
CLD 2014

21. Customer’s instructions
I want a space of at least 80cm at one end of the wall for my tall freezer.
I want units along the rest of the wall.
The base units must have no spaces between them.
Each wall unit must be exactly above a base unit.
Next
CLD 2014

22. Converting Measurements
Next
Converting Measurements
75cm
50cm
58cm
1000mm = 1m = 100cm 500mm = ½m = 0.5m = 50cm 750mm = 0.75m = 75cm 580mm = 0.58m = 58cm
100cm
50cm
58cm
CLD 2014

23. How many Squares? Next 1Metre 25cm 50cm 25cm 5cm
25cm = 10 little squares
1 little square = 25 ÷ = 2.5cm
80cm

24. Add Freezer and Base Units
Next
Add Freezer and Base Units
3.5m
2.75m
Using scales from previous slide add freezer and base units on the drawing.
Freezer
80cm
Gap for the freezer
4 squares = 100cm
Base Unit
50cm
Base Unit
50cm
Base Unit
50cm
Base Unit
50cm
Base Unit
50cm 1m 
CLD 2014

25. Replay
Add Wall Units
3.5m
2.75m
Freezer
80cm
Base Unit
50cm 1m
There should be a gap 50cm high between the base units and wall units.
Draw the base units and the wall units on the scale diagram.
Wall Unit
50cm
Wall Unit
50cm
Wall Unit
50cm
Wall Unit
50cm
Wall Unit
50cm
75cm
50cm
CLD 2014

26. City and guild samples…