First, the calculation method
We separated the two numbers. Now, if the dividend is multiplied by 15 and the divisor is divided by 8, we want to know how the Chamber of Commerce will change. Assuming that the original dividend is a and the divisor is b, the quotient is a/b, the changed dividend is 15a and the divisor is b/8, and the new quotient is (15a)/(b/8).
The original quotient is a/b, and the changed quotient is (15a)/(b/8). In order to find out the change of quotient, we need to calculate the ratio of the changed quotient to the original quotient.
Second, the mathematical formula
Using the mathematical formula, we can express it as: variable quotient/original quotient = (15a)/(b/8))/(a/b).
Now we need to calculate this ratio and find out the change of quotient. The calculation result is that the ratio of the changed quotient to the original quotient is 120.
So if the dividend is multiplied by 15 and the divisor is divided by 8, the chamber of commerce will become 120 times.
Learn the method of mathematical multiplication and division well;
1, understand the meaning of multiplication and division:
Multiplication is the accumulation of addition, and division is the inverse of subtraction. Understand every numerical value in the multiplication table and the concepts of divisor, dividend and quotient in division.
2, master the basic rules of multiplication and division:
Familiar with the basic rules in the multiplication table, such as "99 multiplication table". At the same time, we should also master simple division rules, such as "one divided by one number", that is, a number divided by 1 equals itself.
3, a lot of practice:
Mathematics is a subject that needs a lot of practice. You can deepen your understanding and memory of multiplication and division rules through a lot of practice. In practice, we can try to use various methods to solve problems, such as direct calculation method, decomposition method, multiple method and so on.
4. Develop good study habits:
Review regularly every day, solve problems in study in time, and take notes for reference at any time. At the same time, we should develop the good habit of careful examination and careful calculation.
5, explore the law:
In practice, we should pay attention to exploring the law and find some methods that can simplify the calculation. For example, for some numbers, you can find their multiples or factors for faster calculation.