How to recite multiplication formula quickly

Recently, many students can't recite the multiplication formula. My parents asked me if I had any good methods. The multiplication formula is actually a little bit, as long as you read and write every day, recite line by line, the first line is good, then the next line is recited, then the next line is recited together, then the third line is recited, and the third line is recited over and over again. . This kind of repetition, coupled with parents' reminders and questions (out of order), will soon be mastered by children. If you must ask what skills you have, then I will say a little skill:

From 1 to 5, you can make him feel that 22 is two plus, 33 is three plus, 4 is four plus and 5 is five plus. If children understand the meaning of multiplication, they can quickly find out the solution of the number, and then help them find the law of multiplication and let them memorize it skillfully. So that they can master it quickly.

Some special ones are selected: for example

3824 and 4624 versus 6742

274 to 5840

4936 and 6636 versus 796 13

298 and 368 versus 998 1

Three, four, twelve and two, sixty-two, four, five, twenty

Six, nine, four, five, nine, four, five.

8972 to 3927

The following figures are reversed. 28-6 is the same as 46. Pick out the sum number above, and there will be such a problem in future math problems-write several different formulas to make the products the same. )

Nine is particularly easy to remember: you can let your child stretch out his hands. Ninety, let him bend his left thumb. If you look at two hands, you will get nine. Twenty-nine, you will bend the second finger of his left hand. Bend your finger to the left with 1 as the ten digits, and the left with eight as the single digits to get eighteen. Thirty-nine, you will bend the third finger of his left hand. There are two on the left and seven on the right, so it is twenty-seven. . Wait, I'll get it soon.

You should also remember a few special examples:

5*3= 15 6*6=36 8*6=48 2*6= 12 4*6=24

5*5=25 5*7=35 5*9=45 The first multiplier of these formulas is the same as the single digit of the product, and similar problems will occur in the future: fill the same number (or integer ten digits) in the box below to make the equation hold: □ * 3 = 1 □ * 6 = 4 □.

I hope I can help you, and I hope your children can recite the multiplication formula as soon as possible to lay a good foundation for future study!

How can I quickly remember the multiplication table?

Characteristics of formula

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General 1 and 99 tables only use 9 numbers from 1 to 9.

2. Jiujiu table contains the commutativity of multiplication, so only 8972 is needed, and "9872" is not needed. 9 times 9 has 8 1 product, and the 99 table only needs 1+2+3+4+5+6+7+8+9 =45 product. In the Ming Dynasty, abacus also had 99 tables with 8 1 product. The 99 table of 45 items is called small 99, and the 99 table of 8 1 item is called big 99.

3. The shortest multiplication table in the ancient world. Maya multiplication table must have 190, Babylon multiplication table must have 1770, and Egypt, Greece, Rome, India and other countries must have infinite multiplication tables; Only 45/8 1 item is needed for the 99 table.

4. There is rhythm when reading aloud, which is convenient for memorizing the whole table.

5. Jiujiu watches have existed for at least 3000 years. It was used for calculation from the Spring and Autumn Period and the Warring States Period, and was improved and used for abacus in the Ming Dynasty. The 99 standard is also the basic skill of elementary school arithmetic.

6, another 9:

9X9=8 1 8+ 1=9

9X8=72 7+2=9

9X7=63 6+3=9

: : .

: :

: :

9X2= 18 1+8=9

9X 1=9 0+9=9

99 multiplication formula -99 multiplication formula

"small ninety-nine", that is, the following formula corresponds to "one by one, one by one, two by one, Two two get four ... "1*1=1* 2 = 22 * 2 = 41* 3 = 32 * 3 = 63 * 3 = 91* 4 = 42 * 4.5. 5 = 25 1 * 6 = 6 2 * 6 = 12 3 * 6 = 18 4 * 6 = 24 5 * 6 = 30 6 * 6 = 36 1 * 7 = 7 2 * 7 = 14 3 * 7 = 2 / kloc-0/ 4 * 7 = 28 5 6 * 7 = 356 = 6 1 * 7 = 7 1 * 8 = 8 1 * 9 = 9 1 * 10 = 10 1 * 1 / kloc-0/ = 1 1 1 1 1 * 12 = 12 65438 10 = 20 2 * 1 1 = 22 2 * 1 2 = 242 * 1 3 = 262 *14 = 282 *15 = 302 *16 = 3222 *17 = 342 *1. 3 = 393 * 14 = 423 * 15 = 453 * 16 = 483 * 17 = 5 13 * 18 = 543 * 65438.8 = 32 4 * 9 = 36 4 * 1 0 = 40 4 * 1 1 = 44 4 * 12 = 48 4 * 13 = 52 4 * 14 = 56 4 * 15 = 60 4 * 16 = 64 4 4 * 1 7 = 68 444 * 6543816 = 805 *17 = 855 *18 = 905 *19 = 956 Multiplication: 6 * 6 = 366 * 7 = 426 *. 13 = 78 6 * 14 = 84 6 * 15 = 90 6 * 16 = 96 6 * 17 = 102 6 * 18 = 18.9 = 63 7 * / kloc-0/0 = 70 7 * 1 1 = 77 7 * 12 = 84 7 * 13 = 9 14 = 98 7 * 15 = 105 7 * 16 = / kloc-0/65438 13 = 104 8 * 14 = 12 8 * 15 = 120 8 * 16 = 128 8 8 * 17 = / kloc-0/36 8 * 18 = 144 8 * 8 15 = 135 9 * 16 = 144 9 * 17 = 153 9 * 18 = / kloc-0/62 9 * 19 = 65438. 10 = 100 10 * 1 1 = 10 10 * 12 = 120 1 0 * 13 = 130 10 * 65438 13 = 143 1 1 * 14 = 154 1 15 = 1 65 1 1 * 16 = 176 165438 13 = 156 12 * 14 = 12 * 15 = 1 80 12 * 16 = 192 12 * 17 = 204 65438+ 16 = 208 13 * 17 = 22 13 * 1 The multiplication of 8 = 23413 *19 = 24714 is as follows:15 = 210/4 *16 = 224 624/. 6 = 240 15 * 17 = 255 15 * 18 = 270 15 * 19. 17 = 272 16 * 18 = 288 1 6 * 19 = 304 17 Multiplication: 17 * 17 = 289 65438. The product of 19=323 18 is18 *18 = 32418 *19 = 34219 is:/kloc.

When did the multiplication formula appear?

The multiplication formula (also called "Jiujiuge") has been produced in China for a long time. As early as the Spring and Autumn Period and the Warring States Period, Jiujiu songs have been widely used by people. However, in many works, some multiplication formulas are quoted. The original nine Jiu Ge began with "998 1" and ended with "224". ***36 formulas. Bamboo slips unearthed in the Han Dynasty and ancient wooden slips discovered in Dunhuang all started from "9981". The name "Jiujiu" is the two words that begin with the formula. During the 5th to10th century, the formula of "99" was extended to "One is the same". The order of 99 songs has also become the same as that used in modern times, that is, from "one is the same" to "99.81". The 45-sentence formula in Zhu Yuan's book "Arithmetic Enlightenment" changed from "1 1" to "999", which is called the nine-number method. There are two kinds of multiplication formulas used now, one is 45 sentences, usually called Xiao Jiujiu; There is also a sentence of 8 1, which is usually called Da Jiu Jiu. According to the records in this book, Da Jiujiu was first seen in the book A Collection of Algorithms written by Chen Jie in Qing Dynasty.

What grade does elementary school teach multiplication tables?

Senior two learned multiplication tables last semester.

Supplementary content: 99 multiplication formula

1* 1= 1

1*2=2 2*2=4

1*3=3 2*3=6 3*3=9

1*4=4 2*4=8 3*4= 12 4*4= 16

1*5=5 2*5= 10 3*5= 15 4*5=20 5*5=25

1*6=6 2*6= 12 3*6= 18 4*6=24 5*6=30 6*6=36

1*7=7 2*7= 14 3*7=2 1 4*7=28 5*7=35 6*7=42 7*7=49

1*8=8 2*8= 16 3*8=24 4*8=32 5*8=40 6*8=48 7*8=56 8*8=64

1*9=9 2*9= 18 3*9=27 4*9=36 5*9=45 6*9=54 7*9=63 8*9=72 9*9=8 1

99 times 99 multiplication table

Can only find 99X99 of 19X 19? The multiplication of 1 is:1*1=1* 2 = 21* 3 = 31* 4 = 41* 5 = 5/kloc-. 10 = 10 1 * 1 1 = 1 * 12 = 12 1 * 13 = 13 13 1 * 14 = 65438 10 = 30 3 * 1 1 = 33 3 * 12 = 36 3 * 13 = 39 3 * 14 = 42 3 * 15 = 45 3 * 16 = 48 3 * 17 = 5 13 * 18 = 558 15 = 604 * 16 = 644 * 17 = 684 * 18 = 724 * 1 The multiplication of 9 = 765 is 5 * 5 = 255 * 6 = 305 * 7 =12 = 605 *13 = 655 *14 = 705 * 65438 7 = 49 7 * 8 = 56 7. 0 = 707 * 1 1 = 77 7 * 65438. 15 = 105 7 * 16 = 1 12 7 * 17 = 1 19 7 * / kloc-0/8 = 126 7. 10 = 80 8 * 1 1 = 88 8 * 12 = 96 8 * 13 = 14 8 * 14 = 12 8 * 15 = 120 8 * 16 = 65438 13 = 1 17 9 * 14 = 126 9 * 15 = 135 9 * / kloc-0/6 = 144 9 * 17 = 153 9 * 18 = 162 9 * 13 = 130 10 * 14 = 10 * / kloc-0/5 = 150 10 * 16 = 160 10 * 17 = 170 12= 132 1 1* 1 3= 143 1 1* 14= 154 1 1* 15= 165 1 1* 16 = 176 / kloc-0/ 1 * 17 = 187 1 1 * 18 = 198 165438. 12 = 144 12 * / kloc-0/3 = 12 * 14 = 168 12 * 15 = 180 12 * 16 = 192 15 = 1 95 13 * 16 = 208 13 * 17 = 22 13 * 18 = 234 65438+ 14 = 196 14 * 65438+ 1 The product of 9=285 16 is:16 *16 = 25616 *17 = 27216 *18 = 282. 17 = 28917 *18 = 30617 *19 = 32318 Multiplication:18 */kloc-0

The origin of 99 multiplication table

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.

During the Spring and Autumn Period and the Warring States Period, not only the decimal system was invented, but also the nine-nine watch was invented. Later, the East was introduced to Korea and Japan, and then spread to India and Persia in the west through the Silk Road, which became popular all over the world. Decimal system and nine tables are important contributions of ancient China to world culture. Nowadays, countries around the world rarely use multiplication in Greece and other countries.

In China, the earliest multiplication formula table found at present is one of the more than 30,000 Qin bamboo slips unearthed in Liye ancient city of western Hunan in 2002, in which the multiplication formula is recorded in detail. Different from today's multiplication formula table, the formula table on Qin bamboo slips does not start from "one to one", but from "998 1" to "two to half".

Extended data:

The ancient western civilizations Greece and Babylon also invented the multiplication table, but it is more complicated than the 999 table. There are more than 1700 Greek multiplication tables invented by Babylon, and they are not complete enough. Because they worked hard to calculate multiplication and division before 13 century, people who can divide large numbers will be considered as experts in mathematics.

/kloc-At the beginning of the third century, the eastern calculation method was introduced to Europe through people, and Europeans discovered its convenience, so they learned this new method. At that time, the topic of multiplying two numbers by a new method was the textbook of the university at that time.