How to improve the ability of addition and subtraction in oral arithmetic, and how to improve the ab

Write 20 addition questions within 10, and it is recommended to have 5 lines in one line, a total of four lines.

Let your child focus on checking himself.

Shorten the time and keep the requirements the same.

Increase the difficulty, change to addition and subtraction within 20, of course, there is a process of subtraction within 10 and addition within 20, but the basic method is the same.

Note: When arranging the questions, the child is required to complete them within a certain period of time (the time can be decided according to the child's situation), and then if the wrong questions are within two questions (including two), you can play a game with her. The key to this process is to adhere to the principles, never play if you can't reach the goal, and let the child correct the wrong questions, and encourage her if she corrects the right ones.

Extraction code: 841w Oral arithmetic ability is very important, especially for primary school students, it should be said that it is a necessary ability, if primary school can practice oral arithmetic, it will lay a good foundation for learning mathematics in the future, then, children's abilities are also different, methods are also different, how to let children practice oral arithmetic, improve oral arithmetic ability?

You can practice a lot, stipulate that you practice dozens of oral arithmetic questions every day, and do a test paper every week to see how much time it takes to answer these oral arithmetic questions, so as to show whether you have improved your oral arithmetic ability.

In fact, the main thing is to practice more, practice more, and your oral arithmetic ability will improve, but practice in moderation.

Formula 1: Add 9 to subtract 1, add 8 to subtract 2, add 7 to subtract 3, add 6 to subtract 4, add 5 to subtract 5, add 4 to subtract 6, add 3 to subtract 7, add 2 to subtract 8, add 1 to subtract 9. (Note: The number of additions in the oral decision is the number in the single digit).

Example: 26+38=64 Solution: Add 8 to subtract 2, who subtracts 2? 6 on 26 minus 3 on 10 to 4.

Note: How to carry the ten digits on the last two-digit number, is 1 I enter 2, is 2 I enter 3, is 3 I enter 4, and so on. So where to carry it, enter the second two-digit upper tenth.

If this time it is 3 and I enter 4, it is 2+4=6 in these two two-digit numbers. Here, 26 + 38 = 64 is 6-2 = 4 written in the single place, and 3 into 4 plus 2 is equal to 6 written in the ten place.

Another example is 42 + 29 = 71. Just use the sentence to add 9 to subtract 1, 2-1 = 1, write 1 in the single place, is 2 I into 3, 4 + 3 = 7, write 7 in the ten place to get 71.

The addition of two digits plus two digits without carrying is directly written as a number, such as 25 + 34 = 59, the single digit plus the single digit is written on the single digit after the equal sign 5 + 4 = 9, and the ten digits plus ten digits are written on the ten digits to be 2 + 3 = 5, that is, 59. It is not necessary to calculate vertically.

Verbal decision 2: Subtract 9 to add 1, minus 8 to add 2, minus 7 to add 3, minus 6 to add 4, minus 5 to add 5, minus 4 to add 6, minus 3 to add 7, minus 2 to add 8, minus 1 to add 9. (Note: The subtraction in the oral decision is to say the number of subtraction in the single digit).

Example: 73-46=27, Solution: Subtract 6 to add 4, who adds 4? 3 plus 4 equals 7 written in the single digit, the ten digit of the subtraction is 4, I retreat 5, who retreats 5? 7 back 5, that is, 27.

Note: How do I abdicate? The ten digits of the subtraction are 1 you retreat 2, it is 2 you retreat 3, it is 3 you retreat 4, and so on, but it must be a bit minus a bit and not enough to reduce the situation in order to retreat like this. ）

The above two methods are derived from the method of making up the ten in the first-grade textbook. Their verbal decisions are more or less the same, just remember one of them, and the other method will be able to get together.

The method of addition and subtraction is fast oral arithmetic, so generally speaking, the calculation is carried out from low to high first, and there is a grasp of the whole of carry and abdication, which requires multi-oral arithmetic operation to improve.

Addition and subtraction oral arithmetic skills within 20 years of young promotion and elementary school! With this method, children learn quickly, and parents don't have a headache!

Addition and subtraction oral arithmetic quick calculation skills:

Method 1: Do subtraction and want to add. Think in terms of addition by using the inverse operation relationship of subtraction, which is the inverse of addition. For example, 12-8, think 8+()12.

Method 2: Break the Ten Methods. For example, 13-7 can be thought of like this with "breaking ten methods": 10-7+3=6.

Method 3: continuous subtraction (usual method), such as 13-7 with 'continuous subtraction' can be thought of like this: 13-3-4 = 6, that is, 7 is divided into 3 and 4.

Method 4: Addition and supplementation. For example, 13-7 can also be thought of like this: 13-10+3=6.

There are many oral arithmetic methods, how to find the best method for yourself is the key to improve the speed and accuracy of oral arithmetic, you can review a variety of oral arithmetic methods with students during practice, so that students can get the best method through comparison.

Subtraction Mental Arithmetic:

1. Subtract the integer plus :

For example, 52 7 45, so let's do this: change "7" to "10-3"; Well, 52-10+3 45;

2. Subtract the number of dislocations.

For example, 83-38 45, 8-3 5, 5x9 45;

3. Multi-digit subtraction continuously.

For example, 387 50 42 31 264;First the easy one, 387-50 337, then 42 and 31 to get 73; Then, 337-73, can become 337-80+7 264.

<>1.Guide your child to understand and master oral arithmetic skills.

Oral arithmetic skills are actually the basic knowledge of mathematical calculations. For example, the method of making up ten, decomposition method, ninety-nine addition, subtraction, multiplication, and spike division, number size, carry and borrow, etc., these knowledge seems to be pediatric things in the eyes of adults, but it plays an important role in improving children's oral arithmetic ability. If you can't master these skills, then your child's oral arithmetic level will be poor.

2.Start with children's interests and turn passive learning into active learning.

If you want children to learn mathematics well, it is recommended to start from the aspect of interest, turn passive into active, just like everyone admires edutainment, this way of learning, not only can let children learn lightly, but also learn more efficiently.

3.Wang Tianshuang's title! Hurry up, hurry up!

To improve the ability of oral arithmetic, one is to proficiently recite the addition formula and multiplication formula, and the other method is to practice more, insist on practicing at least 30 oral arithmetic problems every day, first ensure the accuracy, and then practice the speed, in fact, reading the oral arithmetic card is a very good training method.

When encountering arithmetic problems, try to do oral arithmetic, and don't rely on calculators to do more mental arithmetic.

In order to improve one's oral arithmetic ability, it is necessary to pay attention to the speed of mental arithmetic such as observation and mental arithmetic, and improve the judgment ability of logical analysis.

Extraction code: 841w Oral arithmetic ability is very important, especially for primary school students, it should be said that it is a necessary ability, if primary school can practice oral arithmetic, it will lay a good foundation for learning mathematics in the future, then, children's abilities are also different, methods are also different, how to let children practice oral arithmetic, improve oral arithmetic ability?

Hello, first of all, you must discover the rules of numbers, and then your ability to practice oral arithmetic more will improve.

Of course, it's practice, practice more, practice more, practice makes perfect.

Practice more, and don't participate in mental arithmetic learning.