This article for the young and old talks about the origins of our number system and the important role zero has to play in it.
Using balancing scales what is the least number of weights needed
to weigh all integer masses from 1 to 1000? Placing some of the
weights in the same pan as the object how many are needed?
This article looks at how models support mathematical thinking about numbers and the number system
This article for teachers describes how number arrays can be a
useful reprentation for many number concepts.
Dotty Six is a simple dice game that you can adapt in many ways.
This article for teachers describes how modelling number properties
involving multiplication using an array of objects not only allows
children to represent their thinking with concrete materials,. . . .
First or two articles about Fibonacci, written for students.