Being collaborative

There are 308 NRICH Mathematical resources connected to Being collaborative
What is the time?
problem
Favourite

What is the time?

Age
5 to 11
Challenge level
filled star empty star empty star
Can you put these times on the clocks in order? You might like to arrange them in a circle.
What's that graph?
problem
Favourite

What's that graph?

Age
14 to 18
Challenge level
filled star filled star empty star

Can you work out which processes are represented by the graphs?

Making Cuboids
problem
Favourite

Making cuboids

Age
7 to 11
Challenge level
filled star filled star empty star
Let's say you can only use two different lengths - 2 units and 4 units. Using just these 2 lengths as the edges how many different cuboids can you make?
Grouping Goodies
problem
Favourite

Grouping goodies

Age
5 to 7
Challenge level
filled star filled star filled star

Pat counts her sweets in different groups and both times she has some left over. How many sweets could she have had?

Watch the clock
problem
Favourite

Watch the clock

Age
7 to 11
Challenge level
filled star filled star filled star
During the third hour after midnight the hands on a clock point in the same direction (so one hand is over the top of the other). At what time, to the nearest second, does this happen?
Multiplication Squares
problem
Favourite

Multiplication squares

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

Can you work out the arrangement of the digits in the square so that the given products are correct? The numbers 1 - 9 may be used once and once only.

The Deca Tree
problem
Favourite

The deca tree

Age
7 to 11
Challenge level
filled star empty star empty star
Find out what a Deca Tree is and then work out how many leaves there will be after the woodcutter has cut off a trunk, a branch, a twig and a leaf.
Isosceles Triangles
problem
Favourite

Isosceles triangles

Age
11 to 14
Challenge level
filled star empty star empty star
Draw some isosceles triangles with an area of $9$cm$^2$ and a vertex at (20,20). If all the vertices must have whole number coordinates, how many is it possible to draw?
Brush Loads
problem
Favourite

Brush loads

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

How can you arrange the 5 cubes so that you need the smallest number of Brush Loads of paint to cover them? Try with other numbers of cubes as well.

Overlaps
problem
Favourite

Overlaps

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

What does the overlap of these two shapes look like? Try picturing it in your head and then use some cut-out shapes to test your prediction.