Is there a fifth grade math fun problem?,A few questions are OK.,Urgent.

1. Calculation: 1234 + 2341 + 3412 + 4123 (1994 Olympiad Finals test questions).

2. Calculation: 1234 2345-1233 2346 (2006 Zhejiang Summer Camp Competition Questions).

3. Calculation: 7+77+777+7777+77777 (the second primary school "Hope Cup" fourth grade training questions).

4. Calculation: 998 +1413+9989

5. Calculation: 125 25 128 39

6: Calculation: (Question 1 of the 3rd Primary School "Hope Cup" 5th Grade Finals).

7. The age difference between Xiaohong and her mother is 28 years, and her mother's age is 5 times that of Xiaohong. Mom is old, little red is old. (Difference Problem).

8. For a train with a length of 140 meters, it will take minutes to pass through a 400-meter-long tunnel at a speed of 60 kilometers per hour. (Train Journey Issues).

1. Calculation: 9999 1111 + 3333 6667 (National Primary School "Mathematics Olympiad Star" Invitational Contest 2006 Zhejiang Summer Camp Questions).

2. Calculation: 123456 234567-234568 123455 (2005 Primary School Mathematics Summer Camp Test Questions in Four Provinces and 2006 "Innovation Cup" Test Questions).

3. Calculation: 471471471471 157157157157 (2000 Laizhou City, Shandong Province Competition Question).

4. Calculation: 2008 20022002-2002 20082008 (2005 Zhejiang Summer Camp Exam Questions 2002 National Primary School "Mathematics Olympiad Star" Invitational Contest).

5. Calculation: 98989898 99999999 1010101 11111111 (Fujian Province 3rd "Little Torch" Invitational Tournament test questions).

1.Each of the five cards has numbers written on them: 0, 0, 1, 2, 3, and you can use them to form many different five-digit numbers to find all these five-digit numbers. How much.

And. Go up the stairs together, the speed is.

2 times the speed of asking: when.

When you go up to the fourth floor, go up to the ( ) floor.

3 A weed that grows twice as tall every day and grows to 4 in 12 days

When this weed grows to 6 mm, it takes ( ) days.

4 Xiaoqiang has two packets of candies, one with 48 grains and the other with 12 pills, he takes out 3 grains from the more packet at a time, puts them in the less packet, and after ( ) times, the number of grains in the two packets of candy is equal.

5 Immediately after 4444 write a string of numbers, and each number written down is a single digit of the product of the two numbers in front of it. For example: 4 4 = 16, write 6 after 4, 4 6 = 24, and write 4 ,...... after 6Get a string of numbers:

4444644644……, the string of numbers starts from 1 and counts to the right, and the 4444th digit is ( ).

6 Mommy is in.

Above. Eggs have to be fried on both sides, it takes 30 seconds to fry each side, you can only fry two eggs at the same time on this pan, now you need to fry three eggs, it takes at least ( ) seconds.

7 And there were two heaps of fruit, a heap of apples and a heap of pears. If you exchange 1 apple for 1 pear, then there are 2 more apples, if you exchange 1 pear for 2 apples, then there is 1 more pear, think about it, there are ( ) apples, ( pears.

8.When a road is built, there are still kilometers left to be repaired, and it is known that there are more than half of the roads that have not been repaired. The total length of this road is ( ) km.

9.A barrel of oil weighs kilograms, and after half of the oil is used, the barrel weighs grams. This Oak Boy Xiang barrel oil.

Kilogram. Produce a batch of pesticides, tons per day. If the price per 500 grams is yuan. The value of pesticides produced by this plant per day is ( ) yuan.

11.Known A, B, C, Qiwu

None of the numbers are zero, and I know:

A number B = D number B = C number B number.

A number C number.

Compare A, B, C, and more

The size of the number is in descending order, and the third place is ( ).

12.The number in the 100th place after the decimal point is ( ).

15.There are three people, A, B, and C, A walks 50 meters per minute, B walks 40 meters per minute, and C walks 60 meters per minute. A and B from.

Third. At the same time, they set off and walked in relative directions. A meets C 40 minutes after departure, and Liang Bo B meets C after setting off ( ).

1.There are 9 trees, and you need to plant 10 rows, 3 in each row, please help.

According to the title, if there are 3 trees in each row, it seems that 30 trees are needed to plant 10 rows. However, there are now only 9 of them. From this, it follows that at least some trees should be planted at the intersection of several rows (mathematically called emphasis).

To do this, we can design 6 triple points (3-row intersections) and 3 4-key points (4-row intersections).

2.A tree is eight meters high, and a person climbs up four meters every minute and falls down another three meters, asking how many minutes can he reach the top of the tree?

3.Grandpa said to Xiaojun: "My current age is 7 times your age, in a few years it will be 6 times your age, and in a few years it will be 5 times, 4 times, 3 times, and 2 times your age." "How old are Grandpa and Xiaojun now?

Grandpa said to Xiaojun: "I am now 7 times your age".

Then Grandpa's age is now a multiple of 7.

There is a multiple of 7 within 100.

Since this is a practical problem.

Grandpa's age is to consider the 5 numbers 56, 63, 70, 77, 84.

Then the age of the corresponding Xiaojun is 8, 9, 10, 11, 12

Grandpa, who has been X years old, is 6 times older than Xiaojun.

The column equation (8+x)*6=56+x is solved so that x is not an integer, so Xiaojun is 8 years old and this answer is excluded.

The column equation (9+x)*6=63+x solves that x is not an integer, so the answer that Xiaojun is 9 years old is excluded.

The column equation (10+x)*6=70+x is solved x=2, so the answer of Xiaojun 10 years old can be considered.

The column equation (11+x)*6=84+x solves x is not an integer, so Xiaojun is 11 years old and this answer is excluded.

In fact, as long as the current grandfather's age minus 6 times the age of Xiaojun, it is a multiple of 10, and the conditions are met

So now there is the answer Xiaojun is 10 years old and Grandpa is 70 years old.

Then we verify the known conditions.

Grandpa who has been set to be X years old is 5 times the age of Xiaojun.

The column equation (10+x)*5=70+x is solved to x=5

Grandpa who has been X years old is 4 times older than Xiaojun.

The column equation (10+x)*4=70+x is solved to x=10

Grandpa who has been X years old is 3 times the age of Xiaojun.

The column equation (10+x)*3=70+x is solved to x=20

Grandpa, who has been X years old, is twice as old as Xiaojun.

The column equation (10+x)*2=70+x is solved to x=50

Final answer. Grandpa is now 70 years old and Xiaojun is 10 years old.

After 2 years, grandpa is 6 times older than Xiaojun.

After 5 years, grandpa is 5 times older than Xiaojun.

After 10 years, grandpa is 4 times older than Xiaojun.

After 20 years, my grandfather's age is 3 times that of Xiaojun.

After 50 years, my grandfather is twice as old as Xiaojun.

There are a few more that can't be pulled down, see for yourself.

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One factory produces parts, one workshop produces 120 pieces, and two workshops produce 200 percent of one workshopHow many parts are produced in the second workshop?

8-4 = 4 (m).

Because he had reached the top by climbing 4 meters in the end, he didn't have to fall off again, so he actually had to climb 4 meters before.

4 (4-3) = 4 (minutes).

He had to climb for 4 minutes.

4+1=5 (minutes).