Can you guarantee that, for any three numbers you choose, the product of their differences will always be an even number?
Join the midpoints of a quadrilateral to get a new quadrilateral. What is special about it?
Is it possible to have a tetrahedron whose six edges have lengths 10, 20, 30, 40, 50 and 60 units?
Can you select the missing digit(s) to find the largest multiple?
Can you arrange the digits 1, 1, 2, 2, 3 and 3 to make a Number Sandwich?
Two ladders are propped up against facing walls. At what height do the ladders cross?
You are only given the three midpoints of the sides of a triangle. How can you construct the original triangle?
Five numbers added together in pairs produce: 0, 2, 4, 4, 6, 8, 9, 11, 13, 15 What are the five numbers?
