Visualising and representing

problem
Add to 200

Age

11 to 14

Challenge level

By selecting digits for an addition grid, what targets can you make?
problem
Quadrilaterals in a square

Age

11 to 14

Challenge level

What's special about the area of quadrilaterals drawn in a square?
problem
Triangles in a square

Age

11 to 14

Challenge level

What are the possible areas of triangles drawn in a square?
game

Seeing squares for two

Age

5 to 11

Challenge level

Seeing Squares game for an adult and child. Can you come up with a way of always winning this game?
problem
Two spinners

Age

5 to 7

Challenge level

What two-digit numbers can you make with these two dice? What can't you make?
problem
Trisected triangle

Age

14 to 16

Challenge level

Weekly Problem 34 - 2015
Four tiles are given. For which of them can three be placed together to form an equilateral triangle?
problem
Eulerian

Age

14 to 16

Challenge level

Weekly Problem 37 - 2014
Which of the five diagrams below could be drawn without taking the pen off the page and without drawing along a line already drawn?
problem
Product and sum

Age

11 to 14

Challenge level

When Jim rolled some dice, the scores had the same product and sum. How many dice did Jim roll?
problem
Pyramidal n-gon

Age

14 to 16

Challenge level

The base of a pyramid has n edges. What is the difference between the number of edges the pyramid has and the number of faces the pyramid has?
problem
Reflected back

Age

11 to 14

Challenge level

Imagine reflecting the letter P in all three sides of a triangle in turn. What is the final result?