Combinations

There are 149 NRICH Mathematical resources connected to Combinations
Room Doubling
problem

Room Doubling

Age
7 to 11
Challenge level
filled star filled star empty star
Investigate the different ways you could split up these rooms so that you have double the number.
Train Carriages
problem

Train Carriages

Age
5 to 11
Challenge level
filled star filled star empty star
Suppose there is a train with 24 carriages which are going to be put together to make up some new trains. Can you find all the ways that this can be done?
New House
problem

New House

Age
7 to 11
Challenge level
filled star empty star empty star
In this investigation, you must try to make houses using cubes. If the base must not spill over 4 squares and you have 7 cubes which stand for 7 rooms, what different designs can you come up with?
Dice and Spinner Numbers
problem

Dice and Spinner Numbers

Age
7 to 11
Challenge level
filled star filled star empty star
If you had any number of ordinary dice, what are the possible ways of making their totals 6? What would the product of the dice be each time?
Sending Cards
problem

Sending Cards

Age
7 to 11
Challenge level
filled star empty star empty star
This challenge asks you to investigate the total number of cards that would be sent if four children send one to all three others. How many would be sent if there were five children? Six?
Street Party
problem

Street Party

Age
7 to 11
Challenge level
filled star empty star empty star
The challenge here is to find as many routes as you can for a fence to go so that this town is divided up into two halves, each with 8 blocks.
Calcunos
problem

Calcunos

Age
7 to 11
Challenge level
filled star filled star filled star
If we had 16 light bars which digital numbers could we make? How will you know you've found them all?
Newspapers
problem

Newspapers

Age
7 to 11
Challenge level
filled star filled star empty star
When newspaper pages get separated at home we have to try to sort them out and get things in the correct order. How many ways can we arrange these pages so that the numbering may be different?
Little Boxes
problem

Little Boxes

Age
7 to 11
Challenge level
filled star filled star empty star
How many different cuboids can you make when you use four CDs or DVDs? How about using five, then six?
3 Rings
problem

3 Rings

Age
7 to 11
Challenge level
filled star empty star empty star
If you have three circular objects, you could arrange them so that they are separate, touching, overlapping or inside each other. Can you investigate all the different possibilities?