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Shopping Basket

A mathematician goes into a supermarket and buys four items. Using a calculator she multiplies the cost instead of adding them. How can her answer be the same as the total at the till?

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Round and Round and Round

Where will the point stop after it has turned through 30 000 degrees? I took out my calculator and typed 30 000 ÷ 360. How did this help?

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Toad in the Hole

Is it cheaper to cook a meal from scratch or to buy a ready meal? What difference does the number of people you're cooking for make?

Decimal Time

Stage: 3 Challenge Level: Challenge Level:2 Challenge Level:2
What does the word "decimal" make you think of? You could try looking it up in a dictionary.
How many hours are there in one of our days? What time is it half way through our day?
So, what time is it half way through the French decimal day? What does this tell you about the total number of hours in the French decimal day?
Do both systems have the same number of minutes in an hour?
The NRICH Project aims to enrich the mathematical experiences of all learners. To support this aim, members of the NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to embed rich mathematical tasks into everyday classroom practice. More information on many of our other activities can be found here.
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NRICH is part of the family of activities in the Millennium Mathematics Project.