1. Students want to make 28 lanterns, and have already made 18 lanterns. How much more do you want to do? 2.36 butterflies flew away from the flowers and 25 flew away. How many flew away twice?

There are 75 planes in the airport, and 63 have flown away. How many planes are there at the airport now?

Xiaoping planted 7 pots of safflower and the same amount of yellow flowers. How many pots of two kinds of flowers?

5. The school originally had 25 bottles of glue and bought back 19 bottles. How many bottles are there now?

6. Xiao Qiang's family had 36 apples and ate 7. How many?

7. There are 33 vehicles in the passenger station, which have left 13 vehicles. How many cars are there?

8. Children make paper-cuts with 8 pieces of red paper and the same amount of yellow paper. How many sheets of paper did they use?

9. There are 39 horses in the racecourse, and 52 horses have come. How many horses are there in the racecourse now?

10, the store has 25 fans and sold 16 fans. How many fans are there now?

1 1. There are 65 orchids and chrysanthemums, 26 orchids and how many chrysanthemums in the school?

12, Xiaoqing drew twice 17, the first time was nine, and the second time was how much?

13, Xiaohong's family has 33 apples and pears, 14 apples and how many pears?

14. The school wants to distribute 42 boxes of stationery to primary schools in mountainous areas, and has already distributed 27 boxes. How many more boxes do you want to send?

15. There are 1 1 cabbage at home. After eating five, how many more?

16. There are 48 trees on both sides of a road. A * *, how many trees have been planted?

17, 8 cars left from the parking lot, leaving 24 cars. How many cars are there in the parking lot?

18. Eight carts and the same number of cars were taken away from the parking lot. How many cars have been driven away twice?

19. There are 6 footballs in the school gymnasium, and 26 have been bought. How many are there now?

20. Learn from Lei Feng. The team repaired 8 chairs in the morning and 9 chairs in the afternoon. How many chairs have been repaired in one day?

2 1, originally 22 people went to the theatre, and 13 people came and 6 people left. How many people are going to the theatre now?

22. The bakery made 54 loaves of bread. The first group bought 22 loaves and the second group bought 8 loaves. How much bread is left? (two methods)

23. There were 22 boys and 2 girls1person, of which 16 people participated. How many people didn't attend?

24. Three groups * * * collected 94 mineral water bottles, the first group collected 34, the second group collected 29, and the third group collected how many? (two methods)

25. There are 4 1 person on the bus, 3 people on the bus/kloc-0, and 9 people get off the bus. How many people are there on the bus now?

26. Xiaohong has 28 balloons and Xiao Fang has 24 balloons for kindergarten children 15. How many balloons are left?

27. Xiaojun and Xiaoli made lanterns, Xiaojun made 2 1, Xiaoli made 18, and gave them to the teacher 50. How much more will they make? (two methods)

28. This story book has 74 pages. Xiaoli read 20 pages in grade one and 23 pages in grade two. How many pages are left? (two methods)

There used to be 58 sheep in the sheepfold. Six go first, then seven. How many are there now? (two methods)

30. Xiao Dongdong did 10 math problems in the morning, and three more in the afternoon than in the morning. How many did Xiaodong make?

3 1, Xiaohong reads the story book. On the first day, she read 15. The next day, she read six pages less than the first day. How many pages did she read in two days?

32. Xiao Li is 8 years old and his father is 35 years old. How old was Xiao Li when Dad was 50?

33. Xiaodong is 6 years old and his mother is 30 years old. When Xiaodong 12 years old, how old was his mother?

34. My father, mother and brother all broke nine corns, and I broke six. How many corns did our family break?

35. Xiao Li planted five rows of radishes, nine in each row. 15 for the neighbors, how many are left?

36. In the conference room, there are 30 single chairs and 8 double chairs. How many people can sit in a room?

37. The canteen sent three carts of rice, each with eight bags. After eating 18 bags, how many bags are left?

38. There are 40 people crossing the river. Is it enough to rent 8 boats (each boat can only take 4 people) and 1 big boat (each big boat can only take 6 people)?

39. Xiao Li spent money from 8 yuan to buy a pen. The cost of buying a schoolbag is six times that of buying a pen. How much did Xiao Li spend?

45. I have 50 yuan. I want to buy a dress made in 29 yuan and a pair of 18 yuan glasses. How much is left? (two methods)

46. In the 2002 World Cup Asian Top Ten, China scored 12 points at home in Group B, with 5 points less away than at home. What's China's total score?

47. In 2002, in Group B of the Asian Top Ten World Cup, Qatar scored 3 points at home, and the away score was twice as high. What is Qatar's total score?

48. Xiao Li is eight years old. His father is four times as old as Xiao Li. How old is his father?

49. Xiao Gang saved 8 yuan, while Xiao Bing saved nine times as much as Xiao Gang. How much did Xiao Bing and Xiaogang save?

50. Six children have to fold 80 paper cranes, and each has already folded 9. How much more do you want to discount?

extreme

1. Students should make 10 lanterns. Eight lanterns have been made. How much more do they have to do? Six butterflies flew away from the flowers, and five others flew away. How many flew away twice?

There were 15 planes at the airport, and three of them flew away. How many planes are there at the airport now?

Xiaoping planted 7 pots of safflower and the same amount of yellow flowers. How many pots of two kinds of flowers?

The school used to have 5 bottles of glue and bought back 9 bottles. How many bottles are there now?

6. Xiao Qiang has 10 apples. I ate seven apples. How many more are there?

7. There are 13 cars in the passenger station, and three cars have already left. How many cars are there?

8. Children make paper-cuts with 8 pieces of red paper and the same amount of yellow paper. How many sheets of paper did they use?

9. There are 9 horses in the racecourse, and 5 more will come soon. How many horses are there on the racetrack now?

10, the store has 15 fans, and 5 fans have been sold. How many fans are there now?

1 1. The school has *** 15 pots of orchids and chrysanthemums, 6 pots of orchids and several pots of chrysanthemums.

12, Xiaoqing drew twice 17, the first time was nine, and the second time was how much?

13, Xiaohong's family has *** 13 apples, 4 apples and how many pears?

14, shopping.

Ben: 1 Yuan watercolor pen: 13 yuan pen: 1 Yuan angle alarm clock: 29 yuan.

(1) How much does it cost to buy a box of watercolor pens and an alarm clock?

(2) Xiaohong bought a pencil box and paid 5 yuan money. The salesman got back 1 50 yuan. How much is a pencil box?

(3) How can I pay for a pen?

(4) How much is a pen more expensive than a book?

(5) What two things can Xiao Ming buy with 20 yuan money? How much is left?

(6) What other math questions can you ask? Write it out and answer it.

15, one * * *, there are 15 apples, there are 8 apples outside, how many are there in the basket?

16, swimming: 25 people running: 30 people long jump: 20 people

(1) How many more students take part in swimming than in running?

(2) How many runners are there than long jumpers?

(3) What other questions can you ask?

17, Dad: I'm 32 years old. Son: I am 8 years old.

/kloc-how old is the father after 0/0 years?

How many waste plastic bottles did Xiaohua collect?

Xiao Gang: I collected 50 waste plastic bottles.

Xiaohua: I'll take nine more, as much as you.

Tisso

1.7 coins, distributed to 2 people, asking everyone to get an odd number of coins. Can you do it? If it is distributed to three people, everyone is required to get an odd number of coins. Can you do that? 2. Three people eat three steamed buns and eat them in three minutes; According to this calculation, it takes nine people () minutes to eat nine steamed buns.

3. Put 16 chickens into five cages respectively, so that the number of chickens in each cage is different. How to put it? Please fill in the number of chickens in each cage in the five boxes below.

4. The bus runs every 15 minutes. My brother wants to take the 9 o'clock train at 10, but it's already 9: 20 at the station, so he has to wait () minutes before taking the next train.

Turning on the light at night, the tiger was naughty and pulled the switch seven times in a row. Can you tell me if the light is on? We might as well keep asking, pull it eight times? What about nine times? 10? Lianla 100? Can you know if the light is on?

6. Xiao Qiang has 10 apples. I ate seven apples. How many more are there?

7. There are 13 cars in the passenger station, and three cars have already left. How many cars are there?

8. Children make paper-cuts with 8 pieces of red paper and the same amount of yellow paper. How many sheets of paper did they use?

9. There are 9 horses in the racecourse, and 5 more will come soon. How many horses are there on the racetrack now?

10, the store has 15 fans, and 5 fans have been sold. How many fans are there now?

answer

1. Answer: 7 is an odd number, and the sum of two odd numbers must be an even number, so it is impossible to give two people seven coins, and each person gets an odd number of coins. If you give it to three people, you can; 7 can be divided into an odd number plus an even number, and this even number can be divided into two odd numbers, so the sum of three odd numbers can be 7; For example, 1, 1, 5 or 1, 3,3.

2. Answer: According to the first condition, it takes three minutes for one person to eat one steamed bun, so it still takes three minutes for nine people to eat nine steamed buns.

3. Answer: Starting from the smallest number, the sum is 1, 2, 3, 4, 5, and there is still one missing 15. Only by putting the last one in the fifth cage can the number of each cage be guaranteed to be different, so they are: 1, 2, 3, 4 and 6 respectively.

Answer: Because there is a train at 9: 0010, the next train will arrive at 9: 25, so it is still necessary.

25-20=5 minutes

5. Answer: After careful observation, you can find the law:

Pull the pool several times, and the lights are on; Pulled me several times, but the light didn't work.

For large numbers, such as la 100, you can see that the light is not on. Because 100 is an even number.