1, table problem: a square table, cut off one corner, how many corners are left.

2, cut tofu problem: a piece of tofu cut three knives, can be cut into a few pieces at most.

3, the problem of cutting watermelon: a watermelon is cut into seven parts with three knives, and the remaining eight skins are eaten. How?

4. Bamboo pole problem: Can a 5-meter-long bamboo pole pass through the door of 1 meter?

5. Carton Question: Can a one-meter-long square box hold a one-meter-long wooden stick?

6. Clock problem: How many times do the clock and minute hand repeat after 12 hours?

7. origami: a piece of paper with a thickness of 1mm is folded in half 1000 times. How high is the thickness?

8. Pancake problem: It takes two minutes to bake a cake, one minute to bake the front and back, and at most two cakes are put in the pot at the same time, so it takes at least a few minutes to bake three cakes.

9. The approximate area of the school playground, the approximate weight of an object (a bag of salt, some apples, a bottle of ink, etc. ), and the estimated height of people or things.

10. Calculate how many floor tiles are used to spread the floor, how much paint is needed to paint the walls and roofs, and how much materials are needed for indoor decoration households.