Join the midpoints of a quadrilateral to get a new quadrilateral. What is special about it?
I'm thinking of a number. My number is both a multiple of 5 and a multiple of 6. What could my number be?
One block is needed to make an up-and-down staircase, with one step up and one step down. How many blocks would be needed to build an up-and-down staircase with 5 steps up and 5 steps down?
Ten cards are put into five envelopes so that there are two cards in each envelope. The sum of the numbers inside it is written on each envelope. What numbers could be inside the envelopes?
In this article, Alf outlines six activities using the Gattegno chart, which help to develop understanding of place value, multiplication and division.
Bernard Bagnall describes how to get more out of some favourite NRICH investigations.
This article, the first in a series, discusses mathematical-logical intelligence as described by Howard Gardner.
A function pyramid is a structure where each entry in the pyramid is determined by the two entries below it. Can you figure out how the pyramid is generated?
