Reflections on solving problems in vertical calculation;

1. Align the last digit of the two multipliers first.

2. Then use the second multipliers respectively, and multiply each bit with one multiplier in turn, starting from the last bit.

3. Finally, the calculation results are accumulated into products.

4. If the multiplier is decimal, you can expand the corresponding multiple first, and then reduce the product by the corresponding multiple.

Vertical column:

Divide from the top of the dividend first. How many factors are there? Look at the top of the dividend. If it's not enough, watch another one.

Write the quotient on the number except the dividend. If the divisor is not enough, add the quotient 0 to this digit, and the remainder to be divided must be less than the divisor, and the number of divisors in this digit falls to the right of the remainder.

Law of division:

When an integer A is divided by an integer b(b≠0), the quotient is exactly an integer with no remainder. We say that A is divisible by B (that is, B is divisible by A). When the quotient is an integer or a finite decimal and the remainder is 0, we say that A is divisible by B (that is, B is divisible by A). Here, a and b can be natural numbers.

The product of several numbers is divided by a number, so that any factor in the product can be divided by this number and then multiplied by other factors. For example: 8×72×4÷9=72÷9×8×4=256.

The vertical calculation method of division is as follows: when calculating division vertically, the first position of quotient is written wrong. When children see that the single digit of dividend is 0, they tell the teacher in class that when the division ends with 0, they can ignore this principle first. The reason is that they are not familiar with the vertical calculation of division and do not understand it thoroughly.

The significance of vertical calculation:

In order to simplify the calculation, a vertical calculation is listed. In addition calculation, the same numbers are aligned. If the sum exceeds 10, it will move forward to 1. When subtracting, the same numbers are aligned. If it is not enough, borrow 1 from the last digit as 10.

Each transition number is changed by the last transition number, and then the single digits of the last transition number are multiplied by 2. If carry is needed, advance 1, then increase the unit number by ten digits, and so on, and add the new operand to the unit number.