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problem
Coke Machine
14 to 16
The coke machine in college takes 50 pence pieces. It also takes a certain foreign coin of traditional design...
problem
Favourite
1, 2, 3 Magic Square
7 to 11
Arrange three 1s, three 2s and three 3s in this square so that every row, column and diagonal adds to the same total.
problem
Vectors Round a Square
What is special about the relationships between vectors that define a square?
problem
Postage
14 to 16
The country Sixtania prints postage stamps with only three values 6 lucres, 10 lucres and 15 lucres (where the currency is in lucres).Which values cannot be made up with combinations of these postage stamps? Prove that all other values can be made up.
article
Optimising Input - Maximising Output
A group of teachers involved in embedding NRICH tasks into their
everyday practice decided they needed to address the (im)balance
between teacher and student activity in their classrooms. In this
article they share the issues they identified and what they have
been doing to address them.
article
Using Non-Standard Problems to Challenge Pre-Conceptions
This paper explores the value of using problems as a way of
challenging children’s mathematical pre-conceptions and
problems' potential for extending their knowledge and
understanding. It considers some non-standard problems taken from
the NRICH website and examines them in the light of children's
solutions and what children have said, or implied, about their
thinking.