Activity goal 1, let children like math class, feel and like the atmosphere of math class.
2. Let the children know the numbers 1 and 2. 3. Let the children express 1 and 2 in kind in the game.
Prepare the large digital cards of 1, 1, 2 and the corresponding duckling pictures. 2. The pictures of the stick and the duck are posted on two photo frames respectively.
3, a set of digital baby cards 1, two children's hands. During the activity, baby, baby clap your hands, baby, baby clap your legs, baby, baby sit proudly.
Introduction to the activity: Introducing the topic with nursery rhymes: Dear babies, today the teacher brought a nice nursery rhyme. Do you want to listen to it? (thinking ...) Listen carefully to that baby's little ears.
Tell the teacher what you heard after listening to the children's songs. (The teacher sings nursery rhymes): "Digital baby 1 and 2, 1 are thin and long like sticks, and 2 are like ducklings swimming in the water".
Baby, what did you just hear in the children's song? Children speak freely. What does our digital baby look like? The teacher invited them to visit us today.
Baby, let's see if these numbers are like sticks and ducklings as children sing. Now the teacher is coming to invite out the digital baby.
Wow! The digital baby is out! Second, the activity begins: 1, please take out 1, 2 big digital cards and pictures of ducklings, and use the numbers to correspond with the pictures, so that children can see whether the numbers are as sung in the song and deepen their understanding and memory of the numbers. Babies, look at the photos of digital babies that the teacher is holding now. This is "1". Q: What is it? (Children say 1 together, or please tell the baby separately); Hold up "2", this is 2, (please tell the child what this is? ); Look at these digital babies. Do they look the same as these pictures? (Hmm ...) 2. Game: You can watch what I gave you.
The teacher shows the big number cards at will and asks the children to read the corresponding numbers on the cards. Now the teacher takes out a digital baby picture, and the baby reads aloud after the teacher.
At the beginning, with the teacher, the teacher can try not to read halfway. ) the baby is really smart, praise the baby.
3. Perception number: What does "1" mean? The teacher thinks that "1" can represent a chair and a big TV (such as things in the class); Let the children talk. Praise the baby.
Clap game: Baby, the teacher is going to play a game with you now. Clap your hands when you say "1", and clap your hands when you say "2".
The teacher demonstrated first, then joined the children. Third, the game: send the digital baby home. Baby, look at the teacher. There are two boxes with pictures of sticks and ducklings on them. What you have in your hand is a digital baby. Now, the digital baby is going home. Give "1" to the stick and "2" to the duckling.
2. The most magical number
142857 X 1 = 142857 142857 X 2 = 2857 142857 X 3 = 42857 1 142857 X 4 = 57 1428 142857
So how much is 7 times? We will find that it is 999999 and142+857 = 99914+28+57 = 99. Finally, we multiply 142857 by 142857. The answer is: 20408 122449+. 20408+122449 = 142857 About the magical answer: "142857" was found in the pyramids of Egypt, which is a magical number. It proves that there are seven days in a week, and it accumulates itself once, so its six numbers rotate once in order, on the seventh day. The numbers are getting bigger and bigger. Each cycle lasts more than one week, and each number needs to be repeated. You don't need a computer. As long as you know its replication method, you can know that the answer will continue to accumulate. There are more magical places waiting for you to explore! Perhaps, it is the password of the universe. If you find its real magic secret, please share it with everyone! 142857 *1=142857 (original number) 142857*2=2857 14 (rotation)142857 * 3 = 5=7 14285 (rotation)142857 * 6 = 857142857 * 7 = 99999 (9 generations for holidays)142857 * 8 = 7)/kloc 2857142857 *12 =1714284 (5 avatars)142857 *13 =1857/.
Take the mysterious pyramid figures above as an example:1+4+2+8+5+7 = 27 = 2+7 = 9; You see, their singular and singular numbers are actually "9". By analogy, the singular sum of the above mysterious numbers is "9"; It's not weird! (Its even number and the third power of 27 or 3) There must be probability in countless coincidences, and there must be regularity in countless coincidences.
What is the law? Discipline stipulated by nature! Science is to sum up facts and find out laws from them. Take any number, such as 48965, add all the numbers of this number, and the result is 4+8+9+6+5=32, and then add the results to get 3+2=5.
I call this summation method the sum of the modes of a number. All numbers have the following laws: [1] A number with a modular sum of 9 is multiplied by any number, and the modular sum is 9.
For example, the sum of the modules of 306 is 9, while 306*22=6732, and the sum of the modules of the number 6732 is also 9(6+7+3+2= 18, 1+8=9). [2] Multiply a number with a modular sum of 1 with any number, and the result of multiplication is equal to the modular sum of the multiplicand.
For example, the mode sum of 13 is 4325, and the mode sum of 325 * 13 = 4225, 4225 is also 4 (4+2+2+5 = 13,1+3 = [3 ..
Such as 3*4= 12. Take a number whose mode sum is 3, such as 20 1, and then take a number whose mode sum is 4, such as 1 12. Multiply the two numbers and the result is 201*1kloc-0/2 = 225.
[4] In addition, the addition of numbers also follows this law. Such as 3+4=7.
Add the numbers 20 1 and 1 12 and the result is 3 13. Add up the modules of 3 13 and the number is 7(3+ 1+3=7). The result of 3 plus 4 is also 7.
3. Wonderful digital composition
[Wonderful digital composition]
Students, do you want a fast, clever and wonderful digital composition? Then learn quick calculation and clever calculation from me! Please calculate 20022000-19971994-1998-…14-1kloc-0/8-52 solution: this way. According to this feature, the grouping method can be used, that is, two numbers are grouped (because the number of each group is 3), so that the result can be calculated quickly. The original formula = 2002 (2000-1997) (1994-1991) (1998-1995) ... What shall we do? Look at this question, it may be enlightening. From page 0 to page 499 of a book, find the sum of all the digits of these integers. Solution: Let's first observe that 0 499 = 499, 1 498 = 499, 2 497 = 499, 3 496 = 499, ... Step by step, the sum of one-to-one logarithms is 499, which can form 250 pairs. The sum of the numbers of each pair is the sum of the numbers of 499 = 22,250, that is, (4 9 9) *250=22*250=5500. Third, in real life, some regular numbers often appear in cycles. For example, our timing method is 8, 9, 10, 1, 12,1,2, 3 …, and twelve numbers form a cycle. Another example is that there are seven days in a week, which is also a cycle: one day, one, two, three and four. So how do you represent the cycle with numbers? There is a kind of number greater than 0, such as A, where the single digits of A*A*A are the same as those of A, and there are many such integers A. If you arrange them from small to large, what is the 4th1th such integer? Solution: Let's first calculate the product of three identical numbers in1-10: 1 * 1 = 1, 2 * 2 * 2 = 8, 3 * 3 * 3 = 27,4. 8 * 8 * 8 = 5 12, 9 * 9 * 9 = 729, 1 0 */kloc-0 =1000, where14,5,6,9,600. In 1 1-20, only 1 1, 14, 15, 16,19,20 has this property. So the 4th1th such integer is 69. Wonderful digital composition 800-word composition for primary school students (/)
4. The most wonderful number in the world
π. If you think this is a number (π is really regarded as a number in mathematics)
It doesn't just appear in a circle:
1. The probability that two arbitrary natural numbers are coprime is 6/π 2.
2. Take any integer, and the probability that the integer has no repeated prime factor is 6/π 2.
3. On average, any integer can be written as the sum of two perfect numbers of π/4 method.
4. Suppose we have a floor paved with parallel and equidistant wood grains, and randomly throw a needle with a length less than the spacing between the wood grains, and find the probability that this needle intersects one of the wood grains. This is Buffon's needle throwing problem. 1777, Buffon solved the problem himself-the probability value is 1/π.
5. The field equation of relativity: rik-gikr/2+gik = 8 π g/c 4 * tik.
6.20 15, scientists from the university of rochester found a formula with the same pi in the quantum mechanical calculation of hydrogen atomic energy level.