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Chocolate

There are three tables in a room with blocks of chocolate on each. Where would be the best place for each child in the class to sit if they came in one at a time?

Four Triangles Puzzle

Cut four triangles from a square as shown in the picture. How many different shapes can you make by fitting the four triangles back together?

Cut it Out

Can you dissect an equilateral triangle into 6 smaller ones? What number of smaller equilateral triangles is it NOT possible to dissect a larger equilateral triangle into?

Multiples Grid

Age 7 to 11
Challenge Level

There is a clue in the title of the problem!
You may like to investigate this spreadsheet which shades the numbers on the $100$ square. The pictures have been taken from this spreadsheet. Can you see what is happening?
Are there some answers which you can rule out straight away in each case?
How will you know you have all the solutions for each grid?
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.
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NRICH is part of the family of activities in the Millennium Mathematics Project.