Can you fit the tangram pieces into the outline of the house?
Can you fit the tangram pieces into the outlines of the camel and giraffe?
Can you fit the tangram pieces into the outline of the sports car?
Can you picture where this letter "F" will be on the grid if you flip it in these different ways?
How can you paint the faces of these eight cubes so they can be put together to make a 2 × 2 × 2 cube that is green all over AND a 2 × 2 × 2 cube that is yellow all over?
Find $S_r = 1^r + 2^r + 3^r + ... + n^r$ where r is any fixed positive integer in terms of $S_1, S_2, ... S_{r-1}$.
What proportion of people make 90% confident guesses which actually contain the correct answer?
Can you put plus signs in so this is true? 1 2 3 4 5 6 7 8 9 = 99 How many ways can you do it?
