If you have a large supply of 3kg and 8kg weights, how many of each would you need for the average (mean) of the weights to be 6kg?
You have a set of the digits from 0 to 9. Can you arrange these in the five boxes to make two-digit numbers as close to the targets as possible?
Can you find the area of the central part of this shape? Can you do it in more than one way?
Can you find a reliable strategy for choosing coordinates that will locate the treasure in the minimum number of guesses?
On the graph there are 28 marked points. These points all mark the vertices (corners) of eight hidden squares. Can you find the eight hidden squares?
Can you put the numbers 1-5 in the V shape so that both 'arms' have the same total?
If you are given the mean, median and mode of five positive whole numbers, can you find the numbers?
Place the numbers 1 to 6 in the circles so that each number is the difference between the two numbers just below it.
See how the motion of the simple pendulum is not-so-simple after all.
This is a game for two players. Can you find out how to be the first to get to 12 o'clock?
