Working systematically

problem
5 by 5 Mathdokus

Age

7 to 16

Challenge level

Can you use the clues to complete these 5 by 5 Mathematical Sudokus?
problem
4 by 4 Mathdokus

Age

7 to 14

Challenge level

Can you use the clues to complete these 4 by 4 Mathematical Sudokus?
problem
Five more coins

Age

7 to 11

Challenge level

Could Ben have any amount of money between 5p and £2 in his pocket if he has five coins?
problem
The Tour de Clochemerle

Age

14 to 18

Challenge level

Can you work out where these 5 riders came in a not-quite-so-famous bike race?
problem
Isosceles seven

Age

14 to 16

Challenge level

Is it possible to find the angles in this rather special isosceles triangle?
article
Phiddlywinks - a tribute to John Conway

Read this article to find out more about the inspiration for NRICH's game, Phiddlywinks.
problem
Quadratic matching

Age

14 to 16

Challenge level

Can you match each graph to one of the statements?
problem
Are you well balanced?

Age

5 to 7

Challenge level

Can you work out how to make each side of this balance equally balanced? You can put more than one weight on a hook.
problem
Fruity pairs

Age

5 to 7

Challenge level

Which two items of fruit could Kate and Sam choose? Can you order the prices from lowest to highest?
problem
Football sum

Age

11 to 14

Challenge level

Find the values of the nine letters in the sum: FOOT + BALL = GAME