1, Xiaohua's father can cut off five of his own nails in 1 minute. How many nails can he cut in five minutes?
A: Twenty, including fingernails and toenails.
2. It takes three minutes for three children to eat three cakes, and how long does it take for ninety children to eat ninety cakes?
Answer: In three minutes, 90 children eat at the same time.
Mom has 7 pieces of candy. She wants to share them equally with the three children, but she doesn't want to cut the remaining candy. What should mom do?
Answer: Mom eats one piece first, and then gives two pieces to each child.
4. The canteen brought back 70 baskets of Chinese cabbage and radishes, and radishes were more than Chinese cabbage 18 baskets. Then, the cabbage () basket and the radish () basket were brought back.
Answer: 26; 44。
The house has four corners. There is a cat in a corner. There are three cats in front of each cat. How many cats are there in the room?
Answer: 4.
There is a row of trees along the road in the park, and the distance between each tree is 3 meters. What is the distance between the first tree and the sixth tree?
Answer: 15 meter.
7.a is 5 km away from the school, and B is 10km away from the school. How many kilometers are a and b apart?
Answer: 5 km to 15 km.
8. 1 yuan can buy a bottle of soda, and after drinking it, two empty bottles can be exchanged for one bottle of soda. Q: You have 20 yuan money, how many bottles of soda can you drink at most?
Answer: * * * You can drink 37 bottles.
9. Imagine you are in front of a mirror, and the image in the mirror can be reversed. How can you make the image upside down?
Answer: Because the mirror is placed vertically when looking in the mirror, and the mirror is symmetrical, it will not be inverted vertically, but only horizontally. Imagine if the mirror is flat on the floor and people stand on it. Everyone in the mirror is normal, with their heads down and swinging from side to side.
10, what mark can be added between two numbers 2 and 3 to get a number greater than 2 and less than 3?
Answer: decimal point
2. Simple math problems.
1, a string of colored lights, seven numbers of seven, and finally 1 more; Count to nine, the last night; Five numbers of five are just enough. How many colored lights are there at least on this rope?
Two planes, A and B, took off from an airport and flew in the same direction. The speeds of A and B are 300km and 340km respectively. After flying for 4 hours, A should speed up and catch up with B after 2 hours. Ask a's speed?
3. My brother and sister are profitable and go to school from home at the same time. The speed of my brother and sister is 90 meters and 60 meters per minute. When my brother arrived at the school gate, he found that he forgot to bring his Chinese book. He immediately went back the same way and met his sister at 180 meters away from school. How far is their home from school?
4. Party A and Party B practice running. If Party A lets Party B run 10 meter first, Party A will run for 5 seconds to catch up with Party B; If Party A lets Party B run for 2 seconds, Party A will catch up with Party B for 4 seconds. What is the speed of Party A?
Party A and Party B run on a 400-meter-long circular track. When Party A runs 1 min from the starting point at a speed of 300m per minute, Party B runs in the same direction from the starting point. From then on, it took Party A 5 minutes to catch up with Party B. How many meters does Party B run per minute?
3. Simple math problems.
1. Party A and Party B start from point A and walk along the 400m circular runway at the same time. Party A walks 80 meters per minute and Party B walks 50 meters per minute. How many minutes will it take them to meet at point A at least?
Miss Wang bought 20 stamps with 40 yuan money, all of which were 1 yuan and 5 yuan. Ask how many stamps you bought and how many stamps you bought.
3. Mother rabbit goes up the mountain to pick mushrooms. She can pick 30 mushrooms every day in sunny days and 12 mushrooms every day in rainy days. From April 10 to April 29th, we picked 5 10 mushrooms a day without rest. So, how many days are it sunny? How many days is it rainy?
4. Teacher Xiao takes 5 1 students to go boating in the park. They rented 44 boats, including big boats and small boats. Each big boat takes six people and the small boat takes four people. Every bar is crowded with people. How many big boats and small boats did they rent?
5, a car race, 9 days * * * 5000 kilometers. It is known that it travels 688 kilometers a day in sunny days and 390 kilometers a day in rainy days. How many sunny days are there during the competition? There were a few rainy days.
4. Simple math problems.
1, the average score of Chinese and English in the mid-term exam is 83. After the math scores were announced, his average score increased by 2 points. How many points did he get in the math exam?
2. The average of A, B and C is 87; The average of a, c and d is 85. Suppose d is 84, then what is b?
Twenty-four students share a pile of books on average, and then add another student. Everyone shared these books again. On average, there are 2 fewer copies per person than before. How many books are there in this batch?
Eight numbers are arranged in a row, and their average is 54. The average of the first five numbers is 46, the average of the last four numbers is 68, and what is the fifth number?
There are five figures, and the average is 73. The average value becomes 8 1. What's the changed number?
5. Simple math problems.
1 and 1 have 380 pages. The typesetters in the printing factory arranged the book. Only page numbers * * *, how many types do you need?
2. From "1" to "701":1234567891112 ... How many Arabic numerals are there?
3. Storybook only uses 1392 type (number) for page numbering. How many pages are there in this book?
4. How many digits are there in the even series of 2, 4 and 6, ..., 396 and 398?
The compositor divides a book into several pages, while * * * uses 942 numbers (types). How many pages are there in this book?
6. Squares of natural numbers are arranged in a line from small to large: 149 16253649. .................................................................................................................................
7. Let the decimal a = 0123456789101... 998999. What is the number on the right side of the decimal point 1998?
8. A book is ***399 pages with page numbers: 1, 2, 3, 4...398, 399. How many * * numbers are there in the page number?
9. Let the decimal b = 024681012 ...19982000, then what is the 2000th digit to the right of the decimal point?
10. One book was torn in the middle, and the sum of the remaining pages is exactly 1 145. So, what's the page number of the torn one?