Search

problem

Ace, Two, Three...

11 to 14

Can you picture how to order the cards to reproduce Charlie's card trick for yourself?

problem

Favourite

A Puzzling Cube

7 to 11

Here are the six faces of a cube - in no particular order. Here are three views of the cube. Can you deduce where the faces are in relation to each other and record them on the net of this cube?

problem

Millennium Leap

11 to 14

How many leap years will there be between 2001 and 3001?

problem

Wiggly Conversions

11 to 14

Weekly Problem 42 - 2011
Four wiggles equal three woggles. Two woggles equal five waggles. Six waggles equal one wuggle. Using these, can you work out which of four values is the smallest?

problem

Initial Fibonacci

11 to 16

Weekly problem 46 - 2006
What is the first term of a Fibonacci sequence whose second term is 4 and fifth term is 22?

problem

Gridlines

14 to 16

How many triples of points are there in this 4×4 array that lie on a straight line?

problem

Alphabetical Angle

14 to 16

If all the arrangements of the letters in the word ANGLE are written down in alphabetical order, what position does the word ANGLE occupy?

problem

Caught in the Web

14 to 16

Can you estimate the mass of insects caught by spiders in the UK each year?

page

EYFS Thinking About: Four Triangles

Here are some examples of children's thinking about the NRICH task Four Triangles.

Small tomato seedlings in pink pots.

problem

Producing Zeros

11 to 14

Weekly Problem 10 - 2008
If the numbers 1 to 10 are all multiplied together, how many zeros are at the end of the answer?