1, point alignment: the key to accurate calculation
Arrange decimals by numbers so that the decimal points are in the same column. By aligning by digits, we can put the decimal points of the decimals involved in the calculation in the same column for easy calculation. The purpose of decimal point alignment is to multiply the corresponding number accurately, so as to get the correct product.
2. Decimal positioning of decimal multiplication and product
Starting from the unit, multiply the numbers below the decimal point and write them in the corresponding position. Multiply the number in the unit bit with the number in the corresponding bit below the decimal point, and then write the product below the unit bit. Continue to multiply by deciles, percentiles, etc. And write the product on each bit in the corresponding position.
Determine the decimal point position of the product. Determining the decimal point position of the product needs to be calculated according to the number of decimal places involved in the calculation. The decimal point position of the product is related to the sum of decimal places involved in the calculation.
3. Vertical calculation of decimal multiplication: the art and science of multiplication.
Add all the products together to get the final result. In multiplication, we multiply bit by bit and write the product in the corresponding position. Then, we need to add all the products obtained by multiplication to get the final result.
The calculation method of decimal multiplication is similar to integer multiplication, but attention should be paid to the position and alignment of decimal point to maintain the accuracy of product.
Calculation rules and operations of decimal multiplication in practical application
1 and calculation rules of fractional multiplication
Decimal multiplication follows the operation law of integer multiplication. After the digits are aligned, multiply them from right to left, and determine the decimal places of the product according to the decimal places.
2. Practical application of decimal multiplication
Decimal multiplication has many applications in daily life, such as calculating the multiplication and division of currency, calculating the proportion and percentage, and converting between measurement units.
3. Explore more mathematical operations
Besides fractional multiplication, students can also learn and explore other mathematical operations, such as fractional division, addition and subtraction.