First, the table problem, a square table, how many corners are there after cutting off a corner?

Second, the problem of cutting tofu: a piece of tofu can be cut three times, up to a few pieces.

Third, the problem of cutting watermelon: three knives cut 7 petals, eat the remaining 8 skins, how to cut?

Fourth, the bamboo pole problem: can a 5-meter-long bamboo pole pass through the door of 1 meter high?

5. Paper box problem: Can a one-meter-long square box hold a stick of 1.5m?

Sixth, the clock problem: 12 hours, how many times does the clock and minute hand repeat? www.ctwxc.com

Seven, origami problem: a piece of paper with a thickness of 1 mm, folded in half 1000 times, how high is the thickness?

8. How many times does the clock turn from zero, 12 hours, and the hour hand, minute hand and second hand overlap? And inform the overlapping position.

9. Pancake question: Mom needs two minutes to bake one cake, one minute to bake the front and back, and at most two cakes are put in the pot at the same time. How many minutes does it take to bake three cakes at least?

Ten, socks problem, there are five pairs of socks of different colors in the drawer, and the lights are not turned on. How many socks of the same color do you need to pull out?

Eleven, the egg problem: Xiao Zhang sells eggs, a basket of eggs, the first person buys half, Xiao Zhang gives him another one. The second man bought another half, and Xiao Zhang gave him another egg. The third man bought another half egg, and Xiao Zhang gave him another one. The fourth man came to buy half, and Xiao Zhang gave him another one, just after buying the eggs! How many eggs has Xiao Zhang always had?

A complete set of mathematical formulas:

1, each copy × number of copies = total number of copies, total number of copies/number of copies = number of copies, total number of copies/number of copies = number of copies.

2.65438 multiple +0 × multiple = multiple, multiple ÷ 1 = multiple, multiple ÷ multiple = 1.

3. Speed × time = distance, distance/speed = time, distance/time = speed.

4. Unit price × quantity = total price, total price/unit price = quantity, total price/quantity = unit price.

5. Work efficiency × working hours = total workload, total workload ÷ work efficiency = working hours, total workload ÷ working hours = work efficiency.

6. Appendix+Appendix = sum, and-one addend = another addend.

7. The minuend-subtrahend = difference, the minuend-difference = subtrahend, and the difference+subtrahend = minuend.

8, factor × factor = product, product ÷ one factor = another factor.

9. Divider ○ Divider = quotient quilt cover, divisor ○ quotient = divisor, quotient × divisor = dividend.