Decimal elementary arithmetic is an essential knowledge point for primary school students to learn mathematics. Teachers should also give students more interesting, intuitive and effective calculation courses to maximize students' ability to digest and absorb mathematical knowledge. Let's study decimal elementary arithmetic seriously.

1, addition: Because decimals are composed of integer parts and decimal parts. Therefore, in fractional addition, we should first add up the integer parts, then add up the decimal parts, and finally add up the addition results of the integer and decimal parts to get the final result;

2. Subtraction: Similar to addition, in decimal subtraction, you must first subtract the integer part, then subtract the reduced number part, and finally subtract the subtraction results of the integer part and the decimal part to get the final result;

3. Multiplication: in decimal multiplication, the integer part and decimal part of the power number are multiplied by the integer part and decimal part of the multiplier respectively, and then the multiplication results are added to get the final result; ?

4. Division: In the division of decimals, the integer part and decimal part of the dividend should be decomposed first, and the decimal part should be written completely. Then, according to different divisors, each bit of the dividend is divided by the integer part and the decimal part of the dividend respectively, and the final result can be obtained by adding the results of division.

As can be seen from the above, the elementary arithmetic of decimals in mathematics is a very important knowledge point. Learning this part of knowledge well will help students to further improve their learning enthusiasm and strengthen their understanding of mathematics knowledge.