1, splitting method
Split method is used to split a large number into several smaller numbers, thus making the calculation simple. Split method is to split a large number into several smaller numbers, and then calculate them separately, and finally get the result of the original number.
2, correlation and distribution law
The law of association means that in mathematical operations, when several numbers are added or multiplied, the result is the same regardless of their order. The mathematical formula is: (a+b)+c = a+(b+c).
The law of distribution means that when a number is multiplied by several numbers in brackets, the number is multiplied by each number in brackets, and then the products are added. Expressed by mathematical formula: a× (b+c) = a× b+a× c.
3, extracting common factors
Extracting common factor refers to extracting the factors that two or more numbers * * * have in multiplication operation, thus simplifying calculation.
3. Direct calculation method
Direct calculation method is a basic mathematical method, which directly calculates data according to formulas or rules. The direct calculation method is a simple and intuitive method, which will be more complicated when dealing with complex problems.
Skills of mastering simple algorithms in the fourth grade
1, understand the algorithm principle.
Understand the basic principle of the algorithm, why some calculations can be simplified and why some steps can be merged. This helps students to make better use of simple algorithms in calculation.
2. Practice and familiarity
Practice is the key to a simple algorithm. Through a lot of practice, students can really master and skillfully use these algorithms. Practice not only helps students to be familiar with the algorithm, but also helps them to find and understand the mistakes made when applying the algorithm.
3. Cultivate mathematical thinking
Simple algorithm is actually a kind of mathematical thinking, which requires students to observe the characteristics of numbers and operations and find the simplest and most effective solution. Students need to cultivate a mathematical way of thinking, so that they can quickly find a suitable solution when facing problems.