Example 1, (page 2, Unit 1, PEP textbook), this example 1 is a decimal multiplied by an integer, and there are three ways to solve the problem:
Method 1: According to the meaning of multiplication, it can be calculated by addition, that is, 3.5+3.5+3.5 = 10.5 yuan.
Method 2: Convert "3.5 yuan" into a complex number to calculate: 3.5 yuan =, 3 yuan, 3 yuan, x3 = 9 yuan, x3 = 15, 9 yuan+15 = 10.5 yuan.
Method 3: Change "Yuan" into "Angle" for calculation (the following steps are omitted according to the textbook).
Example 2, 0.72x5, (this example is on page 3 of People's Education Edition) is a decimal multiplied by an integer, which can be converted into an integer to calculate. (The problem-solving process is omitted according to the textbook). Note that there are zeros at the end of the product that can be deleted.
Example 3, (this example is on page 5 of People's Education Edition), is a decimal multiplication application problem, and the problem-solving process is omitted according to the textbook.
Decimals multiplied by integers and decimals multiplied by decimals can finally be summarized as follows: one of the two factors has several decimals, and there are also several decimals in the product.