In the game, teach him to calculate with a familiar group of friends, such as 8+5, and let him break 8 into 5+3, because 5 needs to find its friends 5, 5+5= 10, leaving 3, 10+3 = 13. Similarly, you can also split 5 into 2+3. What about subtraction? For example, 1 1-4, let him divide 1 1 into 10+ 10-4=6, leaving the next 1, 6+65438+ Too many games, too fast calculation.
How to teach children to learn addition and subtraction? Because we don't usually pay much attention to it and don't want to add too much burden to our children, we haven't gone to school yet. But then I thought it wasn't like this. All the other children are trying. If we don't work hard, the children will lose at the starting line. But we don't want to take up too much play time for many children. So how to teach children to learn addition and subtraction in the shortest time is a problem before me. What is the practice of the school? Do more exercise. In fact, I feel that children will soon lose interest in playing games. If children always do it right, they will still be interested in learning. If they do something wrong, they will easily lose interest and confidence. I think a lot, and think that addition and subtraction are the two formulas, and I know them by heart. Isn't everything settled? Why is it so complicated to teach children addition and subtraction? I typed out the addition formula table and subtraction formula table with word, which is equivalent to the sharp weapon of addition and subtraction. As long as these two tables are ready, it will be very easy for you to add and subtract. The premise is that children should be able to blurt out the formulas of addition and subtraction, and their memory is different from that of adults. Theoretically, there are two kinds of memory, one is mechanical memory and the other is understanding memory. Compared with adults, children's mechanical memory is much stronger than ours. I made two copies of each table, such as the formula of addition. I put the formula with the answer in the front and the formula without the answer in the back, so that the children can recite the formula without the answer. When they can't recite it, they can refer to the formula with the answer in front. Probably, I test my children twice a day, once before getting up in the morning and once before going to bed at night. As a result, in less than five days, the children are all familiar with it, and it is always 100% to add and subtract numbers. The children are more and more confident in their studies. This kind of heart can also be regarded as a good start for future study. To sum up, some things are simple, so why make them so complicated. Just like how to teach children to add and subtract, it is actually very simple. As long as you are serious, you will always find some very good ways. The following is my own wrod version of the addition formula table and subtraction formula table, which is convenient for everyone to download and use. It mainly includes: addition mathematical formula within 10, subtraction mathematical formula within 10, and subtraction mathematical formula within 20.
How to easily remember the formula of addition and subtraction once every morning, noon and evening? Is it necessary for you to recite this?
Addition and subtraction formula table
Addition formula within 10
1+ 1= 2
1+ 2= 3 2+ 2= 4
1+ 3= 4 2+ 3= 5 3+ 3= 6
1+ 4= 5 2+ 4= 6 3+ 4= 7 4+ 4= 8
1+ 5= 6 2+ 5= 7 3+ 5= 8 4+ 5= 9 5+ 5= 10
1+ 6= 7 2+ 6= 8 3+ 6= 9 4+ 6= 10 5+ 6= 1 1 6+ 6= 12
1+ 7= 8 2+ 7= 9 3+ 7= 10 4+ 7= 1 1 5+ 7= 12 6+ 7= 13 7+ 7= 14
1+ 8= 9 2+ 8= 10 3+ 8= 1 1 4+ 8= 12 5+ 8= 13 6+ 8= 14 7+ 8= 15 8+ 8= 16
1+ 9= 10 2+ 9= 1 1 3+ 9= 12 4+ 9= 13 5+ 9= 14 6+ 9= 15 7+ 9= 16 8+ 9= 17 9+ 9= 18
1+ 10= 1 1 2+ 10= 12 3+ 10= 13 4+ 10= 14 5+ 10= 15 6+ 10= / kloc-0/6 7+ 10= 17 8+ 10= 18 9+ 10= 19
10+ 10=20
Add the formula within 20 minutes.
1+ 1 1= 12 2+ 1 1= 13 3+ 1 1= 14 4+ 1 1= 15 5+ 1 / kloc-0/= 16 6+ 165438+ 0= 17 7+ 1 1= 18 8+ 1 1= 19 9+ 1 1=20
1+ 12= 13 2+ 12= 14 3+ 12= 15 4+ 12= 16 5+ 12= 17 6+ 12= 18 7+ 12= 19 8+ 12=20
1+ 13= 14 2+ 13= 15 3+ 13= 16 4+ 13= 17 5+ 13= 18 6+ 13= 19 7+ 13=20
1+ 14= 15 2+ 14= 16 3+ 14= 17 4+ 14= 18 5+ 14= 19 6+ 14=20
1+ 15= 16 2+ 15= 17 3+ 15= 18 4+ 15= 19 5+ 15=20
1+ 16= 17 2+ 16= 18 3+ 16= 19 4+ 16=20
1+ 17= 18 2+ 17= 19 3+ 17=20
1+ 18= 19 2+ 18=20
1+ 19=20
Subtraction formula within 10
9-9=0 9-8= 1 9-7=2 9-6=3 9-5=4 9-4=5 9-3=6 9-2=7 9- 1=8
8-8=0 8-7= 1 8-6=2 8-5=3 8-4=4 8-3=5 8-2=6 8- 1=7
7-7=0 7-6= 1 7-5=2 7-4=3 7-3=4 7-2=5 7- 1=6
6-6=0 6-5= 1 6-4=2 6-3=3 6-2=4 6- 1=5
5-5=0 5-4= 1 5-3=2 5-2= 1 5- 1=4
4-4=0 4-3= 1 4-2=2 4- 1=3
3-3=0 3-2= 1 3- 1=2
2-2=0 2- 1= 1
1- 1=0
Abacus addition and subtraction formula The abacus addition and subtraction formula table directly adds, subtracts, supplements, subtracts five, adds, subtracts ten, subtracts five, adds, subtracts ten, subtracts five, subtracts ten, subtracts five, adds, subtracts ten, subtracts one, subtracts ten, subtracts one, subtracts one, subtracts two, subtracts one. Minus five, one, one, five, four, one, five, one, five, one, two, four, four, four, four, four, four, four, four, four, four, four, four, four, four, four, four, four, four.
10 to 20 addition and subtraction formulas Practice makes perfect, mathematics is practice, and there is no other shortcut. Just memorize the decomposition and combination sum of numbers within 10, add and subtract 10 and subtract 10. I wish you all the best.
How to make children remember the formula of addition and subtraction because we don't pay much attention to it at ordinary times and don't want to add too much burden to children. After all, we haven't gone to school yet. But then I thought it wasn't like this. All the other children are trying. If we don't work hard, the children will lose at the starting line. But we don't want to take up too much play time for many children. So how to teach children to learn addition and subtraction in the shortest time is a problem before me. What is the practice of the school? Do more exercise. In fact, I feel that children will soon lose interest in playing games. If children always do it right, they will still be interested in learning. If they do something wrong, they will easily lose interest and confidence. I think a lot, and think that addition and subtraction are the two formulas, and I know them by heart. Isn't everything settled? Why is it so complicated to teach children addition and subtraction? I typed out the addition formula table and subtraction formula table with word, which is equivalent to the sharp weapon of addition and subtraction. As long as these two tables are ready, it will be very easy for you to add and subtract. The premise is that children should be able to blurt out the formulas of addition and subtraction, and their memory is different from that of adults. Theoretically, there are two kinds of memory, one is mechanical memory and the other is understanding memory. Compared with adults, children's mechanical memory is much stronger than ours.
Eleven addition and subtraction formulas. Method 1. Two-digit plus two-digit carry addition: formula:
Add 9 minus 1, add 8 minus 2, add 7 minus 3, add 6 minus 4, add 5 minus 5, add 4 minus 6, add 3 minus 7, add 2 minus 8, and add/kloc-0 minus 9 (note: the number of words decided orally is a single place). Example: 26+38=64 Solution: Add 8 and subtract 2. Who will subtract 2? 26 minus 2 equals 6. Three out of 38 will get four points. (Note: How to round the last ten digits is 1, I enter 2, 2, 3, 4, and so on. Where are you taking it? It will go to the top two. If this is 3, I enter 4, and the first two digits are 2+4=6. ) Here, 26+38=64 means that 6-2=4 is written with one digit, and 3 into 4 plus 2 means that 6 is written with ten digits. Another example is 42+29=7 1. Just add 9 and subtract 1, 2- 1= 1, and write 1 in one place, which is 2. I enter 3,4+3 = 7, and write 7 in ten places to get 7 1. This method has learned a hundred tricks, which is faster than a calculator. Two digits plus two digits can be written directly without carry, for example, 25+34=59, one digit plus one digit can be written on the digit after the equal sign, 5+4=9, and ten digits plus ten digits can be written on the tenth digit, which is 2+3=5, which is 59. No vertical calculation is required.
Method two. The abdication subtraction of two digits minus two digits. Formula:
Minus 9 plus 1, 8 plus 2, 7 plus 3, 6 plus 4, 5 plus 5, 4 plus 6, 3 plus 7, 2 plus 8, and 1 plus 9. (Note:
Subtracting a few words from an oral decision means reducing the number of digits. Example: 73-46=27, solution: subtract 6 and add 4, who will add 4? Three plus four equals seven. Written in one place, the decimal place of subtraction is four. I will retire. Who will retire? 7 returns 5, which is 27. (Note: How to abdicate? The decimal place of subtraction is 1, you retreat 2, if 2, you retreat 3, if 3, you retreat 4, and so on. However, this retreat can only be carried out if the single digit is not reduced enough. If you reduce it enough, you can directly reduce one digit, and you can directly determine the number by subtracting ten digits from ten digits. )
The above two methods are all evolved by using the method of supplementing ten in the first grade textbook. Their oral decisions are generally the same, and only one of them needs to be remembered, and the other method can be integrated.
If children can remember the formula of addition and subtraction within 20, the addition within 20 is mainly based on addition and subtraction. After you let your child understand arithmetic, you should let him practice more. Of course, you can let him learn mathematics and do it in his life, which will stimulate his interest and make him feel a sense of accomplishment. When you learn addition well, subtraction will be easy, because abdication and subtraction within 20 are done by addition and subtraction.
No carry addition and subtraction within 20
The numbers 1, 1 1-20 can be played with children. Describe the number in three ways: 1) The digit is 2, and the decimal digit is 1 .2) 1 decimal digit is 1.3) Compared with 65438+.
2. Dial the number with the counter. Parents say the number and children dial the number. Dial and say the number. For example, 12 consists of 1 tens and 2 ones.
3, skillfully recite the formula of carry addition and subtraction within 20.
20+ formula
92 1 1 83 1 1 74 1 1 65 1.
Jiu San 128412Wuqi12Erliu12
94 13 85 13 76 13
Ninth Five-Year Plan 148614erqi14
96 15 87 15
97 16 two 8
98 17
Two nines 18
(Two unified multiplication formulas of Jiujiu 18 are used instead of Jiujiu 18)