GCSE Secondary Maths Age 13-17 - Ratio, Proportion & Rates of Change: Ratio - Explained

The video tutorial explains how to use a scale model to determine the real-life size of an object. It begins by defining the scale as 1:200, meaning one unit on the model equals 200 units in reality. The tutorial then demonstrates how to calculate the real length of a plane from a model measurement of 17 centimeters, resulting in 3400 centimeters or 34 meters. The process includes converting centimeters to meters and concludes with the final answer and marking criteria.

What does a scale of 1 to 200 imply in terms of model and real-life measurements?

• 1 cm on the model equals 2000 cm in real life

• 1 cm on the model equals 20 cm in real life

• 1 cm on the model equals 2 cm in real life

• 1 cm on the model equals 200 cm in real life

If a model plane is 17 cm long, how long is the real plane in centimeters?

• 3400 cm

• 340 cm

• 34 cm

• 1700 cm

How do you convert 3400 centimeters to meters?

• Multiply by 10

• Divide by 100

• Divide by 10

• Multiply by 100

What is the final length of the real plane in meters?

• 340 meters

• 3.4 meters

• 34 meters

• 3400 meters

How many marks are awarded for calculating the correct length in meters?

• 3 marks

• 2 marks

• 4 marks

• 1 mark