Working systematically

There are 617 NRICH Mathematical resources connected to Working systematically
Coins
problem

Coins poster

Age
11 to 14
Challenge level
filled star filled star filled star

A man has 5 coins in his pocket. Given the clues, can you work out what the coins are?

Teddy Town
problem

Teddy town - part five

Age
5 to 11
Challenge level
filled star filled star empty star

There are thirty six teddies in Teddy Town - six red, six blue, six yellow, six green, six purple and six turquoise. There are also thirty six houses, six of each colour. Can you put them on the map of Teddy Town according to the rules?

Teddy Town
problem

Teddy town - part four

Age
5 to 11
Challenge level
filled star filled star empty star

There are twenty five teddies in Teddy Town - five red, five blue, five yellow, five green and five purple. There are also twenty five houses, five of each colour. Can you put them on the map of Teddy Town according to the rules?

Teddy Town
problem

Teddy town - part three

Age
5 to 11
Challenge level
filled star filled star empty star

There are sixteen teddies in Teddy Town - four red, four blue, four yellow and four green. There are also sixteen houses, four of each colour. Can you put them on the map of Teddy Town according to the rules?

Teddy Town
problem

Teddy town - part two

Age
5 to 11
Challenge level
filled star filled star empty star

There are nine teddies in Teddy Town - three red, three blue and three yellow. There are also nine houses, three of each colour. Can you put them on the map of Teddy Town according to the rules?

Adding machine
problem

Adding machine

Age
16 to 18
Challenge level
filled star filled star empty star
Can you set the logic gates so that this machine can decide how many bulbs have been switched on?
Seeing Rhombuses
problem

Seeing rhombuses

Age
7 to 11
Challenge level
filled star filled star empty star

Players take it in turns to choose a dot on the grid. The winner is the first to have four dots that can be joined to form a rhombus.

Seeing Parallelograms
problem

Seeing parallelograms

Age
7 to 11
Challenge level
filled star empty star empty star

Players take it in turns to choose a dot on the grid. The winner is the first to have four dots that can be joined to form a parallelogram.

Rhombus It
problem

Rhombus it

Age
11 to 16
Challenge level
filled star filled star empty star

Players take it in turns to choose a dot on the grid. The winner is the first to have four dots that can be joined to form a rhombus.

Parallelogram It
problem

Parallelogram it

Age
11 to 16
Challenge level
filled star empty star empty star

Players take it in turns to choose a dot on the grid. The winner is the first to have four dots that can be joined to form a parallelogram.