1, Xiaohong, due to carelessness, one plus eight digits were mistaken for three, six digits were mistaken for nine, and the total was 438. What is the correct sum? (writing process)

2. For a three-digit number, the number on the tenth digit is 9, which is exactly three times that of the single digit, and the sum of the three digits is 13. This three-digit number is ()

Xiao Ming wrote five big characters on the first day, and every day after that, he wrote two more big characters than the day before. Six days later, Xiao Ming wrote ().

Thirty students signed up for the art group. Among them, 26 people from the art group and 7 people from the calligraphy group/kloc-0 participated. How many people are there in both groups?

5. There are 35 students in a row in the class, obviously the 20th from the left, and the 2nd1from the right every day. How many students are there between Mingming and Tian Tian?

6. There is a clock that rings several times every hour and rings again every half hour. From now on, until five o'clock, this clock rings ().

7. Fill in 1, 2, 3, 4, 5 and 6 in the following () respectively, and use each number only once.

()×()=()()-()=()

8. How many days did you eat the candy in the box?

There are 45 pieces of sugar in the box. Xiaohong eats three sweets every day and Xiaoyun eats two sweets every day. How many days does it take Xiaohong and Xiaoyun to finish all the sugar in the box?

9. How old is my brother?

Brother's age is the largest single digit plus the smallest two digits, then the largest three digits, and then the smallest four digits. Please help me calculate how old my brother is.

10, the story of climbing a pole

A child is practicing pole climbing. He climbed 3 meters in one breath, but he dropped 1 meter every 2 meters. He must climb 6 meters. How many times does he have to climb?

1 1. Fill in "+","-",× "and ÷" respectively in the following ○, thus establishing the equation:

( 1)424= 1262

(2)284= 1249

12, a three-digit number, the number in the hundredth place is the largest number, and the number in the tenth place is twice that in the tenth place. This number may be:

13, a four-digit number, the number on the highest digit is 2, the number on the hundredth digit is half that on the highest digit, the number on the tenth digit is three times that on the hundredth digit, and the number on the single digit is the same as that on the hundredth digit. This number is ().

14, a four-digit number, the first digit on the right is 3, the third digit is 2, and the tenth digit is three times the hundredth digit. The sum of these four digits is 13. What is this four-digit number?

15. There are 12 lighted candles on the table. First three were blown out by the wind, and then two were blown out by a gust of wind. Finally, how many candles are left on the table?

16. The fox bought a fur coat from 45 yuan in the old goat shop with counterfeit money from 50 yuan, and the old goat returned the money from 5 yuan to the fox. Do you know how much the old goat lost?

17, 24 people lined up, one for two, two for two. Q: How many people are standing still?

18. There are five lights on one side of the alley, and every two lights are 8 meters apart. How long is this alley?

19, 30 cars lined up, counting from the front, the black car is 16, then, counting from the back, where is it?

20. There are two red socks and two black socks in the bag. How many socks can you at least take out to make a pair of socks of the same color?

2 1. Sister is 6 years old and brother is 1 1 year old. When brother 16 years old, how old is sister?

22. Xiaohong did an addition problem and took the second addend of 270 as 720. The calculated total is 960 pounds. What should be the correct sum?

23, a 20 cm long rope first folded in half, and then cut a knife from the middle, how many sections can a * * * cut? How many centimeters are there in each part?

24. 1 watermelon+1 pineapple = 8 kg.

1 watermelon+1 bunch of bananas = 9kg

1 pineapple+1 bunch of bananas = 5kg.

1 watermelon () kg, 1 pineapple () kg, 1 bunch of bananas () kg.

25. There are two numbers, the big one and the small one. Their sum is 99, and the large number is 27 larger than the decimal number. The numbers that make up a large number and a decimal number are the same. What are these two numbers?

26. Miss Li has 60 yuan money just to buy a football and two volleyballs. If you only buy two volleyballs, there will be 28 yuan left. How much is a football? How much is a volleyball?

27. Xiao Min goes to the store to buy stationery. She bought 1 pencil with half of the money she brought, the remaining half bought 1 ballpoint pen, and the remaining 1 yuan. How much money does Xiao Min have?

28. Mom buys pears and gets apples *** 12. Xiaohua asked her how many pears and apples you bought. Mom says there are four more pears than apples, so how many pears and apples are there?

29. A bucket of water weighs 25 kilograms. After using half of it, the bucket weighs 14 kg. How many kilograms of water was used? How many kilograms is a full bucket of water?

30. A basket of apples weighs 14 kg. After eating half the apples, the basket weighs 8 kilograms. How much does this basket weigh? How many kilograms of apples are left?

First of all, use your favorite method to calculate. (4 points per question ×4)

1、 13+ 14+ 15+ 16+ 17+25=( )

2、 1+2+3+……+ 14+ 15=( )

3、25× 18×4=( )

4、464+99+ 10 1- 164=( )

Second, mathematics in life. (3 dots per space ×20)

1. You are () years old this year, and you will be () in 2020.

You go to school () days a week and stay at home () days.

3. Five birds and four white rabbits have () feet.

4. Digital riddles. (1) The head and tail are integrated, and the waist is also integrated. It looks like one, but it's not one. ( )

5. There are 12 children playing the game of "cat and mouse" together, 7 people have been caught, and () people are still to be caught.

6. All the 10 fluorescent lamps in the classroom are on. Now turn off two fluorescent lamps, and there are () fluorescent lamps left in the classroom.

7. If ○+△ = 12, then △+△ =15. Then △ = (), ○ = ().

8. Xiaoli has 18 pictures. After giving Xiaolong three pictures, the number of them is the same. Xiaolong used to have a picture.

9. Some pens are distributed to eight students on average. Just finished writing, there are at least () pens.

10, what can be filled in the brackets? (4 points)

8×( )﹤7 1 47﹥9×( )

( )×7﹤60 23﹥4×( )

1 1, an animated cartoon set starts at 17: 30 and ends at 18: 08. This cartoon was shown for () minutes.

Half of 12 and 8 are not 4. Please guess two numbers, namely () and ().

Three. Practical application. (4 points per question ×6)

Xiaoyun is 8 years old this year. Grandma said, "I will be 62 years old when you reach 12." Grandma is () years old this year.

2. 4 pots of yellow flowers, 5 pots of red flowers, 6 each, one * * * flower ().

Xiaoming has to walk 50 meters from home to school. One morning, he left home for school. After walking 20 meters, I found that I forgot to bring my pencil case, so I went home to get my pencil case and went to school. Xiaoming walked () meters.

4. After using half of the wires, use the remaining half. There are still 6 meters left at this time. It turns out that this wire is () meters long.

There is a giraffe in the zoo. Its age is obtained by subtracting the smallest two digits from the largest two digits and then subtracting the largest one digit. This giraffe is () years old.

6. It takes 1 minute for a cat to eat a fish. In this way, it takes () minutes for 100 cats to eat 100 fish at the same time.