Two digits multiplied by two digits, what should I pay attention to when the column is vertical?

Two-digit multiplication by two-digit vertical considerations1. Digit alignment, multiplying from a single digit;

2. First, use the number of the single digit of the multiplier to multiply the multiplier, and the last digit of the number is aligned with the single digit of the multiplier;

3. Then multiply the number on the tens to multiply the multiplied number, and the last digit of the number is aligned with the ten digits of the multiplier;

4. Then add up the product of the two multiplications.

Vertical formulas.

If the number of digits is the same, write it directly, and write the big one first if the number of digits is different.

The plus sign is written before the second, and the horizontal line is underlined under the second.

Under the horizontal line of the sum of numbers, the horizontal type should also be added to the sum.

Column-vertical method.

1) Write the first addition on the top line first. If the number of digits is not the same, write the number with more digits first;

2) Write the second addition on the next line. If the number of digits is not the same, write the number with fewer digits. The second number should be aligned with the digits of the first number;

3) Put the "+" sign in front of the second number;

4) The "=" sign in the formula is represented by a horizontal line, written below the second number;

5) The result of the two-digit calculation is written below the horizontal line, and it should be aligned with the upper digits.

Two digits multiplied by two digits, what should I pay attention to when the column is vertical?

1. Digit alignment, multiplying from a single digit;

2. First, use the number of the single digit of the multiplier to multiply the multiplier, and the last digit of the number is aligned with the single digit of the multiplier;

3. Then multiply the number on the tens to multiply the multiplied number, and the last digit of the number is aligned with the ten digits of the multiplier;

4. Then add up the product of the two multiplications.

20×20＝？How to say it in words.

The method of multiplying 2 digits by 2 digits with vertical calculation is: align the same digits, start from a single digit, use each of the second factor to multiply each of the first factor by one of the first digits, and then add the results obtained, pay attention to the same digits to be aligned.

For example, 12x13, step 1: 3x12=36, step 2: 10x12=120, and add up to 120+36=156 according to the above calculation results.

It can also be calculated in the sense of multiplication.

The vertical column of two digits by two digits is as follows:

1. Digit alignment, multiplying from a single digit;

2. First use the number of the single digit of the multiplier to multiply the multiplier, and the last digit of the number and the single digit of the multiplier are aligned.

3. Then multiply the number on the tens to multiply the multiplied number, and the last digit of the number is aligned with the ten digits of the multiplier;

4. Then add up the product of the two multiplications.

The method of calculating the vertical division of the division.

Such as 42 divided by 7. Divine wisdom.

Start with 4 and divide from high to low . When the division method is calculated vertically, it starts to divide from the highest digit, for example: 42 is divided from the highest ten digit 4; If you can't get rid of it, such as:

Song rent 4 cannot be divided by 7, so divide by combining the highest digit with the next digit until you can divide by the divisor.

Until; For example, if 42 is divided by 7 and 4 cannot be divided by 7, 4 and 2 are combined into a number 42 to divide 7, and the quotient is 6.

The vertical formula for two digits multiplied by two digits is as follows:

Multiplication vertical calculation should pay attention to the problem:

The last digit of the two numbers is to be aligned.

Try to write the numbers with more numbers on the top and the numbers with fewer numbers below to reduce the number of multiplications.

Calculation method: 1. When several multiplication rental cars are added and subtracted, and these products have the same factor, we can use the method of extracting disadvantages and taking the common factor for clever calculation. If the other factors in the product are added and subtracted, the result is exactly a whole number.

Ten, hundreds, thousands, thousands, or some relatively simple numbers, then the calculation is easier. This method is called the "Common Factor Extraction Method".

2. In order to be able to "round" or make up a relatively simple number, it is often necessary to split the numerator or denominator in the fraction first, and then perform the grouping operation. This method of clever calculation is called the "splitting method", also known as the "decomposition grouping method".

3. In the fraction formula with more numbers of the same number, a part of the formula is represented by letters to make the operation more convenient. This is the algebraic method in fractional formulas.

Two-digit multiplied by two-digit vertical:First, use the number of the multiplier unit to multiply the multiplied number, align the last digit of the number with the unit digit of the multiplier, and then use the number on the multiplier to return to the dozens of digits to multiply the multiplier, and the last digit of the number is aligned with the ten digits of the multiplier, and then add up the numbers obtained by the two multiplications.

Vertical, refers to the change of each transition number from the previous transition number, the single digit of the previous transition number multiplied by 2, if you need to carry the digit, then advance to the front by 1, and then the single digit rises by 10 digits, and so on, and the single digit is filled with a new operation number.

Because each complement needs to be filled with two digits, when there is more than one digit to be opened, it is necessary to ensure that the complement cannot be sandwiched with a decimal point. For example, three digits must be calculated separately with hundreds of acres, and the number of ten digits and single digits must be added when supplementing.

Multiplying the 1st digit of a number key by the 1st digit of another number should be added to the i+j-1 digit of the product. As for what you said about "over 10", it doesn't matter, just carry it up directly.

Multiply the unit of the second multiplier by the first multiplier. Then multiply the first multiplier by the ten digits of the second multiplier, and the result is how many tens, and in order to indicate how many tens, the end of the product is aligned with the ten digits of the second multiplier.

Two digits multiplied by two digits, note when the column is vertical:

1. Digit alignment, multiplying from a single digit;

2. First, use the number of the single digit of the multiplier to multiply the multiplier, and the last digit of the number is aligned with the single digit of the multiplier;

3. Then multiply the number on the tens to multiply the multiplied number, and the last digit of the number is aligned with the ten digits of the multiplier;

4. Then add up the product of the two times and hold it.

Vertical calculation process of multiplying two digits by two digits:

Problem solving ideas: first align the last digit of the two multipliers, and then use the second multiplier respectively, from the last digit to each digit according to the rotten and cautious times to pay tribute to a multiplier, and finally the calculated result is the product, if the multiplier is a decimal place, it can be expanded by the corresponding multiple, and finally the product is reduced by the corresponding multiple, for example: 25 12 = 300

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Two-digit multiplied two-digit vertical bridge hunger calculation process:

Problem solving ideas: first align the last digit of the two multipliers of the stool dust, and then use the second multiplier respectively, multiply a multiplier for each number from the last digit in turn, and finally add up the calculated result as the product, if the multiplier is a decimal number, you can first expand it to the corresponding multiple, and finally the product is narrowing the corresponding multiple, jujube Zen example: 25 12 = 300

First, use the number of the multiplier unit to multiply the multiplied number, align the last digit of the number with the unit digit of the multiplier, and then use the number on the multiplication tens to multiply the multiplied number, and the last digit of the obtained number is aligned with the ten digit of the multiplier, and then add up the numbers obtained by the two multiplications.

The vertical calculation process of multiplying two digits by two digits Wu Zhizhi:

Example: 25 12 = 300

Turn left|Turn right.

Multiplication refers to a shortcut to add up the same numbers. The result of this operation is called the product. From a philosophical point of view, multiplication is the result of a qualitative change caused by the quantitative change of addition.

After falling in love with each other, you cry, and if you leave, you will live up to love.

Single digits are aligned to single digits, and tens are aligned to tens of digits.

When the single digit of the two-digit number is multiplied by the three-digit number, the last digit of the product and the single digit of the two-digit number are aligned;

When the tens of the two-digit number are multiplied by the three-digit number, the last digit of the product is aligned with the ten-digit of the two-digit number;

First, use the two-digit digit and the number on the ten digit to multiply by three digits respectively; Multiply the digit of the two-digit number, and the last digit of the multiplied number will be aligned with which digit; Add the numbers multiplied twice to get the result.

Multiply the multiplier by the unit digit and the ten digit of the multiplier, and then add up the resulting product. Note that the end of the product of the tens is aligned with the tens.

Vertical two-digit by three-digit number.

Just pay attention to the number of digits.