how to learn abacus multiplication

There are many kinds of cultural relics abacus. For example, the blue-and-white baby abacus of Jingdezhen kiln in Qing Dynasty was a historical relic. Its blue-and-white color was elegant, the glaze was bright and lustrous, the color of the body was white and yellow, and there were obvious flint red spots. The body was solid and the body was thick. The abacus was rectangular and made in imitation of a wooden abacus. It was 29.7 cm long, 13.9 cm wide, 3 cm thick, and weighed 1702 grams. There were 11 stalls. There were 2 beads on the beam in the middle of the stall (5 beads per stall) and 5 beads under the beam (1 bead per stall). Two beads were broken in a small stall, leaving a total of 75 beads. The inner wall of the abacus was glazed, and the outer wall was decorated with blue-and-white baby play patterns. The image of a child was vivid and lifelike. The counting beads were glazed with white glaze, and the bottom and inside of the abacus were exposed without glaze and rough. Several cracks on the body had been repaired. It provided physical evidence for the study of Jingdezhen blue-and-white porcelain production technology in the Qing Dynasty and traditional China calculation tools. There was also the Diamond Abacus, which was originally the collection of Chen Baoding, a famous collector in Shanghai. Later, it was given to the Abacus Museum in Huangshan City for display. These cultural relics reflected the technological level, cultural value and historical significance of the abacus in different periods. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

Abacus comics usually have unique art styles and interesting storylines that attract readers.

Nine Nine to One was the mnemonic formula for reduction and restoration in the abacus. The abacus's incantation, Nine Nine to One, had specific calculation operations, such as "one up one, one down five to four, one to nine into one, two up two, two down five to three, two to eight into one, three up three, three down five to two, three to seven into one, four up four, four down five to one, four to six into one" and so on. The abacus formula was based on an algorithm invented using counting sticks. It was suitable for the abacus and had a history of more than 2600 years. With the use of the abacus, people summed up these formulas to increase the speed of calculation. Furthermore, the concept of "Nine Nine to One" had evolved from a chant in the abacus to a common saying in life. It referred to returning to the beginning, the original state. 'The Myth of True Love in the Pangu Progenitor Universe' is equally wonderful. Please click to read it!

In the anime " Fox Demon Little Matchmaker," Tushan Rongrong was the second in command of Tushan. She was known as the " strongest brain," and had the title of Thousand-faced Fox.  She was in charge of Mud Mountain's financial affairs, and she always had an abacus in her hand. Whenever there was a need to provide services, she would record the accounts. While waiting for the TV series, you can also click on the link below to read the original work of " Little Fox Demon Matchmaker " to understand the plot in advance!

There were several ways to achieve inverse voltage multiplication: 1. The input voltage was raised using a transformer, and then converted to a reverse voltage through a rectify circuit. 2. Using a voltage doubler circuit, the voltage was increased by connecting multiple reactors in series. 3. A voltage doubler circuit was used to increase the voltage through a multi-stage rectify and filter. 4. Using a voltage amplifier to amplify the input signal to increase the reverse voltage, the negative feedback method can be used to connect the amplifier circuit to obtain the reverse proportional voltage. In addition, there are also chip TC682IOA, TC682COA inverted voltage multiplying IC chips that can be used in related circuits. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The following is an example of a teaching reflection on the law of multiplication: ** I. Reflection on the overall teaching situation ** The laws of multiplication included the commutativity law, the association law, and the distribution law. In the teaching process, the overall teaching arrangement should follow the students 'cognitive laws and start from the students' existing knowledge base. ** 2. Strengths of Teaching ** 1. ** Knowledge Connection ** - The law of multiplication was usually taught after the law of addition, which provided a good foundation for students to learn the law of multiplication. For example, the commutative law of addition and the commutative law of multiplication had certain similarities. Students could understand the commutative law of multiplication by analogy. This kind of knowledge transfer would help students accept new knowledge content faster. 2. ** Teaching Method Usage ** - Creating life situations (such as sports games, planting trees, etc.) was an effective teaching method when exploring the commutive law and the association law of multiplication. It could stimulate students 'interest in learning, make students more intuitively feel the connection between mathematics and life, and pave the way for the concept of the law of multiplication. - When guiding students to explore the distribution law of multiplication, it was a good choice to introduce practical problems that students were familiar with. Students were allowed to use their existing knowledge to migrate, explore and discover the rules by themselves, and verify the rules through examples. This could cultivate the students 'ability to think and explore independently. 3. ** Cultivating students 'abilities ** - In the teaching process, by letting the students calculate the exercises, divide them into groups to compete for the red flag, and so on, the students could find problems in the calculation, explore the problems, and verify the rules. It was helpful to cultivate the students 'ability to find problems, analyze problems, and solve problems. At the same time, it could also increase the students' participation and let the students understand the law of multiplication more deeply. ** 3. Inadequacies in the teaching process ** 1. ** Concept Division ** - Although it was beneficial to distinguish the two laws when combining them in teaching, some students still did not have a clear distinction between the two laws. This might be due to the lack of in-depth analysis and comparison of the two concepts in the teaching process, which led to students being easily confused in practical application. 2. ** Difficulty Breakthrough ** - The distribution law of multiplication was a difficult point in teaching. For some simple calculations with slight changes, such as 3.8×9.9 and 102×0.45 in the multiplication of decimals, the students had a high error rate. This reflected that in the teaching process, the explanation of the various forms and flexible applications of the multiplication distribution law was not thorough enough, and some students could not draw inferences from one example. 3. ** Student participation ** - There were shortcomings in the group cooperation and exchange learning, and the students 'autonomy and inquiry learning were not fully reflected. It could be that the task allocation was not clear enough, or the teacher's guidance during the group discussion was not timely and effective enough, resulting in some students not fully participating in the group discussion and learning. 4. ** For all students ** - In teaching, due to the large number of students, some students who did not like to speak rarely had the opportunity to express themselves. This showed that the teaching process did not pay enough attention to the needs of all students and did not provide equal opportunities for each student to learn and display. ** IV. Modification measures ** 1. ** Strengthened Concept Teaching ** - In the future, for concepts that were easily confused, such as the commutive law of multiplication and the law of association, the time for comparison teaching should be increased. More examples and exercises should be used to deepen the students 'understanding and distinction of concepts. 2. ** Breakthrough Difficulties ** - In order to deal with the difficulty of the multiplication distribution law, special exercises should be added. From simple to complex, students should be gradually guided to master the various application forms of the multiplication distribution law. For questions that students were prone to making mistakes, they had to analyze and explain in detail to help students understand the solution. 3. ** The optimization team cooperated to learn ** - The tasks and goals of the group cooperation were clearly defined. The division of labor in the group was done in advance to ensure that each student was clear about their role and tasks in the group. In the process of group discussion, teachers should strengthen patrol and guidance, answer students 'questions in a timely manner, and encourage every student to actively participate in the discussion. 4. ** Pay attention to all students ** - Design more interaction sessions to encourage students who don't like to speak to actively participate in classroom interactions. He could use a tiered teaching method, designing questions and exercises of different difficulty according to the students 'learning ability and level, so that each student could improve within their own ability and have the opportunity to show their learning results. Through the reflection of the teaching process of the law of multiplication, the advantages and disadvantages of the teaching were clarified, which provided a direction for the future teaching improvement, so as to better improve the teaching quality and help students to grasp the law of multiplication and its application more deeply. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

There are 2 baskets, and each basket has 9 apples. So 2 times 9 is 18 apples in total.

The characters included the male lead, Luo Feng, and the female lead, Mo Yuzhu. "Mortal's Little Abacus" author: Climbing the Peak. It was a Xianxia/fantasy immortal cultivation novel with system elements, intelligence online, and mortal elements. [User recommendation: The legend of transmigration to immortality has become a small abacus that no one remembers.] With the spiritual tea in hand, there was no need to worry about resources. Old Demon Han was destined to become a Time Dao Ancestor, a Time Zenith Heaven. But where was Luo Feng's path? He, who possessed the bloodline of a Divine General, was destined to not be ordinary. I hope you will like this book.

A Record of a Mortal's Journey to Immortality was a popular Xianxia novel written by Wang Yu and published on Qidian Chinese website. This novel told the story of a mortal who gradually grew up and entered the immortal world through firm faith and low-key cultivation. The readers could read or listen to books on the Qidian Reading App. The audio book recommendation team was large and the post-production was excellent. Han Li's character was extremely realistic, perfectly displaying the differences between immortals and mortals and the vicissitudes of life. Now, you can even get an experience member by going to Qidian to listen to books! You can read authentic books and listen to authentic audio on the Qidian Reading App. The male lead, Han Li, had a firm belief, meticulous thinking, and was extremely cautious. He knew how to advance and retreat, and how to endure. The female lead, Nangong Wan, had a gentle and lively personality. She had an elegant and noble temperament and was beautiful.