2. Meaning of decimals: Divide the integer "1" into 10, 100, 1000 ... These scores or fractions can be expressed in decimals.

3. The decimal point has an integer part on the left, a decimal part on the right, followed by decimals, percentiles and thousandths.

4. Classification of decimals: Decimals are limited to decimals.

Unit 2 Fractional Multiplication:

1, the meaning of decimal multiplication is the same as that of integer multiplication: finding the sum of several identical addends is a simple operation.

2. The calculation rule of fractional multiplication by integer: fractional multiplication by integer, the product of fractional numerator multiplied by integer is numerator, and the denominator remains unchanged.

3. Integer multiplied by fraction: Fraction multiplied by integer can be regarded as the sum of several fractions. An integer multiplied by a fraction can be regarded as finding the fraction of an integer.

Extended data:

Math learning methods in the sixth grade of primary school

1, grab the class

The most important thing to study on weekdays is to study in class. Listen carefully, follow the teacher's ideas and summarize the mathematical thinking methods that the teacher has talked about.

2. Finish the homework with high quality

Not only the speed is high, but also the accuracy is high. When writing homework, if you repeat the same type of questions, you should pay more attention to speed and accuracy. You should think and summarize such questions every time you finish, so as to further improve yourself and the rules and skills of solving problems.

3. Think hard and ask more questions.

For the laws and theorems given by teachers, we should not only know why, but also know why. Ask questions about the teacher's explanation and the content of the textbook, so as to remove hidden dangers in learning.