Scale drawings

Scale drawings
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Slide 1: Diapositive
MathematicsLower Secondary (Key Stage 3)

Cette leçon contient 13 diapositives, avec quiz interactifs et diapositives de texte.

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Scale drawings

Slide 1 - Diapositive

What is a scale drawing?

Slide 2 - Carte mentale

Slide 3 - Diapositive

Slide 4 - Diapositive

What is a scale drawing?
  • Scale drawings represent real objects with accurate lengths reduced or enlarged by a given
  • scale
  • Scale drawings  are commonly seen as smaller representations of large objects including buildings, gardens and vehicles.
  • Scales might be written as a stated scale e.g. 1cm = 1m
  • Or as a ratio 1:50
  • This means that every 1cm on the plan is worth 50 cm in real-life



Slide 5 - Diapositive

Scaling up
  • This means we are changing scale measurements to real-life measurements
  • So in the scale 2cm = 1m, every 2 cm on the plan is worth 1m (or 100cm) in real-life. 
  • Let's take some examples:

Slide 6 - Diapositive

2cm = 1m
  • The length of a room on a scale plan is 16cm. What would this be in real-life. 
  • Answer: 8m
  • The width of a room on a scale plan is 7m. What would this be in real-life? 
  • Answer: 14cm
  • A book shelf is 1.2cm wide on a scale plan. What would this be in real-life?
  • Answer: 0.6m
  • A playmat is 4cm wide on a scale plan. What would this measurement be in real-life? 
  • Answer: 2m 

Slide 7 - Diapositive

Slide 8 - Lien

Scaling down
  • This means we take a real-life or actual measurement and change it to a scale measurement. 
  • So in the scale 2cm = 1m, every 2 cm on the plan is worth 1m (or 100cm) in real-life.
  • Let's take some examples:

Slide 9 - Diapositive

2cm=1m
Use this scale to work out what some everyday items would be on the plan. 
  • A sand tray which is 70 cm wide
  • 70cm= 0.7m (Make sure the cm are converted to metres)
  • 0.7 x 2 = 1.4cm (multiply number in m by 2 and this will give the scale measurement).
  • A water tray that is 50cm wide
  • 50cm = 0.5m
  • 0.5x 2 = 1m

Slide 10 - Diapositive

How can we change our actual measurements to scale measurements using the scale 2cm=1m?

Slide 11 - Question ouverte

Slide 12 - Lien

Task
Finish your scale drawings from last week
Add only items longer than 50cm. 

Slide 13 - Diapositive