Mathematical multiplication formula table
One by one.
One, two, two, two, four.
One, three, two, three, six, three, three and nine.
Fourteen is four, two, four, eight, three, four, twelve, four, forty-six.
15 is 525, 135, 1525, 4525525.
16 is 62, 62, 38, 46, 24, 56, 36, 636.
Obtained .51989.99999998985
18 get 82 86 384 48312 584 68418 78516 8864.
1992 983927 4936 594 15 6954 796 13 8972 998 1
The origin of multiplication formula table
The 99-99 multiplication melody is also often called "Little 99". At present, the formula for students to learn "elementary ninety-nine" is from "11" to "998 1", while in ancient times it was the other way around, from "998 1" to "224". Because the first two words of the formula are "99", people call it "99" for short. It was only in the 13 and 14 centuries that it turned into the present situation.
China used the "99 formula" earlier. Sentences such as "3927", "684 18", "483 12" and "6636" can be found in books such as Xunzi, Guanzi, Huainanzi and Warring States Policy. It can be seen that as early as the Spring and Autumn Period and the Warring States Period, 99 multiplication songs became popular.
Memory method of multiplication formula table
1, upright back
For example, one gets one from one, one gets two from one, all the way back to nine in 1999, then four from two to two, six from two to three, until 298, then nine from three to three, 342, until 3927, and so on, and then 446, 5525 in turn. There is a rule in this method, that is, the number of digits in the vertical column increases gradually, which can help memory.
2. Turn your back to one side
For example, you are crazy first, sentence by sentence; The second sentence is two sentences, one sentence is two sentences, and two sentences are four sentences; By analogy, the first few lines are only a few sentences, and the last nine sentences range from 199 to 998 1. There is another rule in this method. In the first few lines, the last sentence is a few more than the previous one.
Step 3 twist your head
For example, recite one or two to get two, and then recite two or two to get four. At this time, turn it down and recite two or three to get six, and two or four to get eight until 298; Then go back to one three to get three, two three to get six, three three to get nine, and then turn down to three four twelve until three nine twenty-seven; And so on, go back to a four, get a four, and then turn. One of the characteristics of this recitation is that there are nine sentences in the formula from one to nine, and several formulas will gradually increase.
Learning method of multiplication table
1. Divide 5 hours into 30 10 minutes. Tell your child that he will have 10 minutes to recite multiplication formula every day. After 10 minutes, he can only arrange study time or play. 30 10 minutes =30 days.
2. Let the children prepare notebooks and pens, as well as a table. Note that children must prepare themselves. After all, learning is your own business.
3, you should have guessed what to do, just let the children copy the multiplication table. Copy 1 time every day, remember that it is only 1 time. Don't be greedy, or it will be counterproductive.
4. It may be impossible to completely copy in the first 3 days 10 minutes. Children can be encouraged to spend a little more time, usually around 12 minutes. After 1 week, the replication speed will be lower than 10 minute. Because he began to recite the formula table unconsciously, but he didn't know it. Once you use these five hours, it will be 30 days. Basically, children can recite formulas. Is memory still a problem?
5, the core point: when copying, ask the children to read the copied sentences, and be sure to pronounce them, otherwise the effect is not obvious. Be sure to remember this. That is, while reading and writing. Well, after 1 month, the memory problem of the formula table can be easily solved. Warm reminder can last longer.
6, as long as the child's memory is good enough, according to this method, basically 1 week can remember the formula table!