Can you think of a piece of mathematical equipment that might be useful in finding the mystery location?


Can you think of other games you could play using your atlas and scale? Discuss it with the people near you.


While warming up for PE, the teacher asked her 6th class to do a lap of the outside of the PE hall, but nobody knew how far they had to run. One bright spark suggested they could work it out by looking at the plans of the school buildings. This is the plan.


23cm


18cm


PE HALL


Scale 1cm : 3.9m What is the perimeter of the PE hall?


There are a couple of ways of working out the actual perimeter. You could work out the perimeter of the scaled-down drawing and then multiply by the scale, or you could work out the actual length and the actual width and work out the perimeter from there. Try both ways and see which way you find easier.


Option 1 (23 + 18) × 2 = perimeter perimeter × 3.9m = actual perimeter Option 2


23 × 3.9m = actual length 18 × 3.9m = actual width


(actual length + actual width) × 2 = actual perimeter


Length 145


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