Starter Can you answer the question below the
Starter Can you answer the question below the triangles? Even better, can you link it to the topic we have been looking at?
Maps and Models • We have looked at simplifying Ratio • Today we will be looking at Ratio in several situations • We will look at how ratio are used on maps and models.
Maps and Models • When you are told a map is in the ratio 1: 1000, what does this actually mean? 1 cm on the map = 1000 cm in the world 1 inch on the map = 1000 inches in the world 1 ‘any distance’ on the map = 1000 of that distance in the real world
Maps and Models • A map of a town shows the town’s key buildings. The map is in the ratio 1: 5000. • On the map, the lake is 5 cm long. How long is it in the real world? x 5 Map World 1 : 5000 5 : 25000 x 5 ÷ 100 25000 cm 250 m
Maps and Models • A model plane is in the ratio 1: 100. The model is 13 cm wide. How wide is the actual plane in metres? Model World 1 : 100 x 13 13 : 1300 x 13 ÷ 100 1300 cm 13 m
Maps and Models • On a map, 2 cm represents 1500 m. What is the map ratio? ÷ 2 Map World 2 cm : 1, 500 m 2 cm : 150, 000 cm x 100 1 cm : 75, 000 cm ÷ 2 1 : 75, 000
Maps and Models • On another map, 5 cm represents 2 km. What is the map ratio? Map World 5 cm : 2 km ÷ 5 x 1000 5 cm : 2, 000 m 5 cm : 200, 000 cm x 100 1 cm : 40, 000 cm ÷ 5 1 : 40, 000
Maps and Models • We have looked at using ratio in several situations • We have looked at questions involving maps and models • We have looked at working out a ‘map ratio’
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