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problem

Favourite

Summing Consecutive Numbers

11 to 14

15 = 7 + 8 and 10 = 1 + 2 + 3 + 4. Can you say which numbers can be expressed as the sum of two or more consecutive integers?

problem

Favourite

Three Neighbours

7 to 14

Take three consecutive numbers and add them together. What do you notice?

problem

Ideal Axes

16 to 18

Explore how can changing the axes for a plot of an equation can lead to different shaped graphs emerging

problem

Pinhole Camera

11 to 14

Make your own pinhole camera for safe observation of the sun, and find out how it works.

problem

Time to Evolve

14 to 16

How many generations would link an evolutionist to a very distant ancestor?

problem

Favourite

More Magic Potting Sheds

11 to 16

The number of plants in Mr McGregor's magic potting shed increases overnight. He'd like to put the same number of plants in each of his gardens, planting one garden each day. How can he do it?

problem

One Basket or Group Photo

7 to 18

Libby Jared helped to set up NRICH and this is one of her favourite problems. It's a problem suitable for a wide age range and best tackled practically.