In 0. Multiply () by () =2.4 and fill in a number in each box. How many ways to fill in a qualified * * *? List one by one.

2.0.(4) times (6) = 2.4;

3.0.(6) times (4) = 2.4;

4.0.(8) times (3)=2.4.

Multiplication is a shortcut to add up the same numbers. The result of its operation is called product, and "X" is the symbol of multiplication. From the philosophical point of view, multiplication is the result of qualitative change caused by additive quantity. The multiplication of integers (including negative numbers), rational numbers (fractions) and real numbers is a systematic summary of this basic definition.

Multiplication can also be seen as calculating the objects arranged in a rectangle (integer) or finding the area of a rectangle with a given side length. The area of the rectangle does not depend on which side is measured first, which shows the exchange property.

Multiplication is one of the four operations, such as 4 times 5, that is, 4 is increased by 5 times, or 5 times 4 is added together.

Extended data:

1, integer multiplication calculation rules

(1) Multiplies the first factor by the number on each bit of the second factor from the cell;

(2) Multiply by the number on the second factor, and the last digit of the number is aligned with the second factor;

(3) Add the multiplied numbers.

Decimal multiplication and division calculation rules

2. Decimal multiplication calculation rules

First, calculate the product according to the calculation rules of integer multiplication, and then look at the factor * * *, how many decimal places there are, just count a few from the right side of the product and point to the decimal point; If the number of digits is not enough, use "0" to make it up.