(1) Because 14 flowers are collected every day on average, * * collects 1 12 flowers, so we can find out how many days * * collected? 1 12÷ 14=8 (days)

(2) If you haven't learned the division in which the divisor is a two-digit number, you can also use this step of guessing (that is, trial and error):

If you pick it for 5 days, you can pick 14×5=70 pine nuts, less;

If you need 10 day, you can pick 14× 10= 140 pine nuts, much more;

If you pick for 8 days, you can pick 14×8= 1 12 pine nuts, that's right!

It can be found that the process of "taking the number" in the trial method is actually a process of "going back and forth" and "repeatedly" making up the number.

2. Pupils' Olympic List Attempt

1, a math exam, it is stipulated that you get 5 points for doing a right question and 3 points for doing a wrong question. Xiao Wei did 10 and got 34 points. How many questions did he answer correctly? 2. Xiaoyan is 10 years old and her father is 40 years old. Her father is four times as old as Xiaoyan. A few years later, Dad was exactly twice as old as Xiaoyan.

3. My brother is 8 years old, and my brother 14 years old. How old are they when the sum of their ages is 48?

4. Squirrels pick 20 pine nuts every day in sunny days, 12 in rainy days and12 in rainy days, with an average of 14 per day. What is a rainy day?

5, 100 people eat 92 steamed buns, one adult eats 2, and two children eat 1, just finished eating. How many adults and children are there?

6. Two brothers went fishing, and * * * caught 52 fish, of which the younger brother caught 1, twice as much as the older brother. How many fish did they catch?

7. 10 RMB 45, 5 yuan RMB * * *, a total of 350 yuan. 1how much is 0 yuan? How much is 5 yuan money?

The kindergarten distributed a batch of oranges to the children. If each student in the big class gives 5, the rest is10; If you give 8 students to each small class, you will be short of 2. It is known that the number of small classes is three less than that of large classes. How many oranges are there in this batch?

3. Pupils' Olympic List Attempt

1. A well is 6 meters deep. There is a little frog at the bottom of the well. The frog jumped 2 meters high. How many times can a frog jump out of the well? Mingming and Honghong went to buy a bunch of flowers. Clearly less 10 yuan, red less 25 yuan. They can buy this bunch of flowers together. How much does this bunch cost?

Pleasant goat got a huge sausage 4 meters long. Now cut the sausage into small pieces 1 meter long. How many times should Joey cut it?

Giraffe asked lamb, "A bamboo pole has two heads, two bamboo poles have four heads, and four and a half bamboo poles have several heads?" The lamb turned nine heads happily. "Lamb answer right? Why?

5. Adult ticket to the safari park is 40 yuan, and child ticket is 15 yuan. Xiaoming and his parents went to the safari park. How much is the ticket?

4. Pupils' Olympic List Attempt

1, representing an integer as the sum of several natural numbers smaller than it is called integer splitting. How many different ways are there to split the integer 4? 2. Use a balance and weights of 1g, 3g and 9g (no other items are used as weights). When the weights can only be placed on the same plate, how many kinds of weights can be called?

3. With 1, 2,3 * * *, how many different three digits can these three numbers make up? Who are they?

There are five steps in front of the post office, and it is stipulated that only one or two steps can be climbed on one step. So how many different ways are there to climb this step?

5. Cookies are sold in the store, including 10 boxes of 5 kg, 4 boxes of 2 kg and 8 boxes of 1 kg. The customer wants to buy cookies weighing 9 kilograms. How many delivery methods does the salesman have in order not to unpack and carry easily?

5. Primary school students' Olympic list attempt

1, Xiao Gong's car is running forward. The conductor counted the number of people on the bus and said that there were twice as many people who didn't buy tickets as those who did. Do you know how many passengers bought tickets on the bus? Solution: at least 1 person. Because the conductor and driver never have to buy tickets, this is the "implicit condition" of the topic. Sometimes it is found that "implicit conditions" will make the problem-solving situation suddenly clear.

2. As we all know, generally speaking, the sum of several numbers is less than their product, for example, 2+3+4 is less than 2×3×4. Then please answer: Is the product of the sum or multiplication of 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 big?

Solution: And big. Note: "0" is a very characteristic number. (1) 0 added to any number still equals the number itself;

② The time product of 0 multiplied by any number is equal to 0; Write them down:

0+1+2+3+4+5+6+7+8+9 = 450×12× 3× 4× 5× 6× 7× 8× 9 = 0, so we should pay attention to special cases.

3. The sum of two numbers is greater than one number 17 and greater than the other number 15. Do you know what these two numbers are? Do you think of general relations from this? Solution: These two numbers are 17 and 15.

Because their sum is 17 greater than 15 and 15 greater than 17.

Association and generalization from special cases to general ones is one of the characteristics of mathematical thinking. This question may make you associate with the following: sum-15= 17, then sum = 15+ 17.

Generally sum = one number+another addend, or written as sum- one addend = another addend, or written as minuend-subtraction = difference, or written as minuend-difference = subtraction.

6. Primary school students' Olympic list attempt

1, there is an old mother. She has three boys, and each boy has a sister. How many people are there in this family? Solution: There are five people in the family. My sister is the youngest. She is every boy's sister. If you list the formula: 1 mother +3 boys +3 sisters =7 people, it is wrong. Why? Please think about it.

Xiaoming gave Xiaogang two pencils, so they all have the same number of pencils. How many pencils does Xiaoming have than Xiaogang?

Solution: Xiaoming has four more pencils than Xiaogang.

Note that it is not two watches; If there are only two more, Xiao Gang will have two more than Xiao Ming, not the same amount.