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Rule of Three
If it takes four men one day to build a wall, how long does it take 60,000 men to build a similar wall?
How Big?
If the sides of the triangle in the diagram are 3, 4 and 5, what is the area of the shaded square?
Age 11 to 14
Challenge Level
What do you need to know to work out each athlete's speed?
How can you work out the speed in kilometres per hour?
If his swimming speed is slower than 4.5km/h, would you expect him to burn more or less than 600 kcal per hour?
Once you know the rate at which he burns calories, how will you work out how many calories he burns in 19 minutes and 12 seconds?
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NRICH is part of the family of activities in the Millennium Mathematics Project.
NRICH is part of the family of activities in the Millennium Mathematics Project.