1 out of 3
Can you find rectangles where the value of the area is the same as the value of the perimeter?
2 out of 3
Place four pebbles on the sand in the form of a square. Keep adding as few pebbles as necessary to double the area. How many extra pebbles are added each time?
2 out of 3
Can you decide whether two lines are perpendicular or not? Can you do this without drawing them?
1 out of 3
Five children are taking part in a climbing competition with three parts, where their score for each part will be multiplied together. Can you see how the leaderboard will change depending on what happens in the final climb of the competition?
While musing about the difficulties children face in comprehending number structure, notation, etc., it occured to the author that there is a vast array of occasions when numbers and signs are used in anomalous ways; often these are at the earliest stages, when they must be enormously confusing. However, they also frequently happen in adult situations.
1 out of 3
Shogi tiles can form interesting shapes and patterns... I wonder whether they fit together to make a ring?
2 out of 3
The triathlon is a physically gruelling challenge. Can you work out which athlete burnt the most calories?
