1, addition-complement method: divide the decimal into large numbers; Make it 10 and add the remainder.

2. subtraction-decimal method: divide a large number by10; Reduce the quantity, increase the quantity.

3. Subtraction-Borrowing Ten Method: Divide by a large number and lend10; Reduce the quantity, increase the quantity.

4, subtraction-flat ten method: look at large numbers, divide by decimals; The result is obtained by continuous subtraction.

Mathematical thinking ability:

1, computing power

Digital computing ability is computing ability. For the first-grade children, it is to learn the rules of addition, subtraction, multiplication and division in 20 minutes, and then master simple arithmetic.

2. Imagination ability

Mathematical imagination refers to geometric space. Many people think that geometry knowledge is only exposed to children in the fifth or sixth grade of primary school or even junior high school. In fact, any spatial figure that children come into contact with is geometry, and spatial imagination needs to be cultivated from an early age.

3. Logical thinking ability

Many parents pay attention to logical thinking ability, which is really important. The logical thinking ability that children can exercise in mathematics is very important in the future study of science knowledge.

4. Application ability

Mathematical application ability is to connect mathematics with real life, apply mathematics to life, find problems, find problems and solve problems with mathematics, which is also the interest of mathematics.

Math learning methods are as follows:

1. To learn mathematics well, we must grasp three "basics": the basic concepts should be clear, the basic laws should be familiar, and the basic methods should be skilled.

After you finish the topic, you must sum it up carefully, so that you won't spend too much time and energy when you encounter similar problems in the future.

3, we must fully understand the mathematical concepts, don't generalize.

4. The ultimate goal of learning concepts is to solve specific problems with concepts. Therefore, we should actively use the mathematical concepts we have learned to analyze and solve related mathematical problems.

5, to master the problem-solving methods of various types of questions, consciously sum up in practice, and slowly cultivate the analytical habits that suit you.