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Pizza Portions

My friends and I love pizza. Can you help us share these pizzas equally?

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Red Balloons, Blue Balloons

Katie and Will have some balloons. Will's balloon burst at exactly the same size as Katie's at the beginning of a puff. How many puffs had Will done before his balloon burst?

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In the Money

There are a number of coins on a table. One quarter of the coins show heads. If I turn over 2 coins, then one third show heads. How many coins are there altogether?

Pies

Stage: 2 Challenge Level: Challenge Level:2 Challenge Level:2
What are you trying to find out?
What do the two weights weigh altogether?
If you took the quarter pie off the scales, what could you do to the whole pie to make the scales balance?
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.