How to estimate the third grade of mathematics

In the third grade of mathematics, estimation is an important skill, which can help students get approximate answers quickly and improve the calculation efficiency.

The following are some common evaluation methods and techniques:

1, rounding method: when adding or subtracting, the numerical value can be simplified to a number convenient for calculation. For example, 23+ 18 is estimated to be 20+20=40. This method is suitable for large values.

2. Approximation method: When performing multiplication, the numerical value can be approximated to the nearest integer and then calculated. For example, 7.6×4.3 is estimated to be 8×4=32. This method is suitable for fractional multiplication.

3. Estimation and adjustment: When performing complex calculations, you can estimate the results of each step and adjust the next calculation according to the estimated results. For example, when calculating 456+22 1, it can be estimated as 450+220=670, and then the adjusted value is 456+221= 670+1= 671.

4. Simplify the problem: When solving practical problems, you can simplify complex values or calculations into a more manageable form. For example, 4.35×80 is estimated as 4×80=320, and then it is adjusted according to the estimation result.

5. Use approximate values: Students can use some common approximate values for estimation. For example, π is about 3, and radical number 2 is about 1.4. These approximations can be used to simplify the calculation and estimate the results.

Methods of learning mathematics

1. Understanding concepts: Mathematics is based on a series of concepts and principles, so understanding concepts is the key to learning mathematics. When learning new mathematical concepts, we should carefully read textbooks or reference books to understand the definition, nature and application. You can deepen your understanding of the concept through examples, exercises and practical problems.

2. Problem-solving skills: Mathematics is a very practical subject, and solving problems is an important part of learning mathematics. Mastering problem-solving skills is helpful to improve the efficiency and accuracy of problem-solving. You can get familiar with all kinds of problem-solving methods and skills by doing a lot of exercises, and pay attention to summing up the ideas and methods of problem-solving.