Next, we invited six families from the Elf Kingdom to help children memorize multiplication formulas quickly.
Mechanical memory method of mechanical family
The elves of the mechanical clan have a good eloquence and are good at reciting. Therefore, they like to repeat the multiplication formula. But their method is very special!
■ upright.
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.
■ Cross back.
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.
■ Turn back.
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 formulas from one to nine, and a few formulas are gradually increased.
Understanding memory and understanding family.
Elves who know the family are good at logical reasoning. When they can read out the formulas in sequence, there must be some formulas that they are familiar with, such as: 25 10/0,9981etc. Taking these formulas as reference objects, they can quickly find the adjacent multiplication formulas through calculation.
For example, if you can't figure out the result of 8×9, you can think of "9 9 minus 1 9", that is, "8 1-9=72". Of course, you can't write 72 after reaching a conclusion, but you should also recite the formula of "8×9" in your mind. After so many thoughts, the sentence "8972" will also become. In this way, the effect should be more obvious from some formulas to all formulas.
Contrast memory method of contrast family
The elves of the comparison clan are good at observing and comparing. So they found the following rules.
■ Products with the same product quantity: (the two multipliers are not duplicated)
14 is four and 22 is four.
Six out of sixteen, six out of twenty.
Eight out of eighteen, eight out of twenty-four
262, 342
Nine out of nine, nine out of three.
368, 298
286, 446
3824, 6424
6636, 4936
■ The two multipliers are the same:
One gets one, two gets four,
Three, three, nine, 46,
Five, five, twenty-five, six, six, thirty-six,
7749, 8864,
998 1.
■ Ten digits and single digits of products are interchangeable:
274, 5840.
34 12, 372 1
5945，6945
4936, 796 13
3927, 8972
■ The product is an integer of ten:
25 10, 4520
5630, 5840.
Story memory method of story family
Stories are loved by story family elves, and some recipes are special. They can use stories to help them learn to remember.
For example, Tang Priest and his disciples experienced 81 difficulties in the process of learning scriptures, the Monkey King changed in 1982, and Zhu Bajie changed in 4936. When he met a monster, the Monkey King waved a golden hoop and hit him.
Game memory method of game family
The elves of the game family like to turn anything boring into an interesting game. Look:
■ Formula game of fencing:
Two people index with their hands at the same time. For example, one person holds out four fingers to say four, another person holds out six fingers to say six, and then the one who says 24 first wins. Punch several times like this. The two sides can agree how many times to win, and they can reward a candy.
■9 Formula Finger Memory Game:
First of all, through observation, we can find the characteristics of the formula of 9:
Due to the multiplication formula of (1)9, the number of units is "9- 1", and 1 is decreased in turn.
(2) The sum of two digits in the multiplication formula of 9 is equal to 9.
■ 9' s finger memory game:
As shown above, put your hands flat. When reciting the formula of "Nine in Nine", bend the little finger of your left hand, and there are nine fingers on the right side of the bent finger. This "9" indicates that the product bit is 9;
When reciting "298", bend the ring finger of the left hand, and there is a heel finger on the left side of the bent finger. This "1" represents the number 1 on the tenth digit of the product, and there are eight fingers on the right side of the bent finger. This "8" represents the number 8 in the single digit of the product, which is "298", and so on.
Counting from left to right, the first finger bends to represent the number nine, the left side of the bent finger represents the tenth digit of the product, and the right side represents the number of the unit of the product. Students are interested in it and remember it clearly.
Application storage method of application family
The elves of the application family like to apply mathematics in their lives and learn in their applications.
As the saying goes, mathematics comes from life and is applied to life. The application of multiplication formula permeates all aspects of our lives. If we want to master it more skillfully, parents should make use of all relevant opportunities to let their children use multiplication formulas to calculate the results. I believe that children will be willing to show what they have learned in front of their parents, and it is extremely happy to experience the value of their own learning, which will inspire children to learn more.