Exploring and noticing

There are 412 NRICH Mathematical resources connected to Exploring and noticing

problem

Favourite

Sizing them up

Age

5 to 7

Challenge level

Can you put these shapes in order of size? Start with the smallest.

problem

Favourite

Factor-multiple chains

Age

7 to 11

Challenge level

Can you see how these factor-multiple chains work? Find the chain which contains the smallest possible numbers. How about the largest possible numbers?

problem

Favourite

The legacy

Age

14 to 16

Challenge level

Your school has been left a million pounds in the will of an ex- pupil. What model of investment and spending would you use in order to ensure the best return on the money?

problem

Favourite

Two-digit targets

Age

5 to 7

Challenge level

You have a set of the digits from 0 to 9. Can you arrange these in the five boxes to make two-digit numbers as close to the targets as possible?

problem

Favourite

Follow the numbers

Age

7 to 11

Challenge level

What happens when you add the digits of a number then multiply the result by 2 and you keep doing this? You could try for different numbers and different rules.