60 formulas containing decimal points for division, multiplication, solution of equations, and off f

Decimal multiplication and divisionOff-line calculationsThere are the following:

1. Decimal multiplication and exclusion method off-form calculation:

2. Decimal multiplication and division off-form calculation:

3. Decimal multiplication and division off-form calculation:

Fourth, decimal multiplication and division off-form calculation:

5. Off-form calculation of decimal multiplication and division:

6. Decimal multiplication and division off-form calculation:

7. Decimal multiplication and division off-form calculation: land chain.

8. Decimal multiplication and division off-form calculation of early posture Sun:

Solution 1: ,

It is known that the decimal point of the dividend is omitted from the market outlook 130 * because it is two decimal places, so the original number =

So solution 2:

Because the decimal point of two decimal places is omitted, it is equivalent to the dividend being expanded by a factor of 100, so the correct quotient = 130 100 =

Dividend =

Calculate the number that was missed from the decimal point first, yes.

Revert to the original dividend is.

Omitting the decimal point expands the dividend by a factor of 100, so the dividend is and the quotient is.

130 multiplied equals 195 (the number obtained by omitting the decimal point), and because it is a 2 decimal place, it should be:

1. Integer multiplication rule:

1) From the right, multiply the first factor by the number on each of the second factor, and the end of the number will be aligned with which digit of the second factor;

2) Then add up the numbers that you have multiplied several times.

Multiply with 0 at the end of an integer: you can first multiply the numbers before 0, and then see how many zeros there are at the end of each factor, and add a few zeros to the end of the multiplied number. )

2. Decimal multiplication rule:

1) Calculate the product according to the rule of integer multiplication;

2) If you look at how many decimal places there are in the factor, count the number from the right side of the number, and point to the decimal point.

3) There is 0 at the end of the decimal part of the number, and the 0 should be removed and simplified.

3. Fraction multiplication rule:

Multiply the numerators of each fraction as the numerator, multiply the denominator of each fraction as the denominator, and then reduce the fraction.

4. The division rule of integers.

1) Start from the high position of the dividend, first see how many digits there are in the divisor, and then try to divide the first few digits of the divisor with the divisor, if it is smaller than the divisor, try to divide one more digit;

2) Divide to the digit of the dividend, write the quotient on that digit;

3) The remaining number after each division must be smaller than the divisor.

5. The divisor is the decimal division rule of an integer:

1) Remove according to the law of integer division, and the decimal point of the quotient should be aligned with the decimal point of the dividend;

2) If there is still a remainder at the end of the dividend, add zero after the remainder and continue dividing.

6. The divisor is the decimal division rule for decimals:

1) First look at how many decimal places there are in the divisor, move the decimal point of the dividend to the right by a few places, and make up with zero if the number is not enough;

2) Then divide by decimal division where the divisor is an integer.

7. The division rule of fractions:

1) Multiply the numerator of the dividend by the denominator of the divisor as the numerator;

2) Multiply the denominator of the dividend by the numerator of the divisor as the denominator. (i.e. the dividend is unchanged, multiplied by the reciprocal of the divisor).

1.Integer addition calculation rule: the same digits are aligned, from the lowest digit, the number on which digit is added to the full ten, the previous digit is advanced by one.

2.Integer subtraction calculation rule: the same digits are aligned, from the low digits, the number on which digit is not enough to subtract, it will be subtracted from its previous digit to make ten, and the number on the base is merged together, and then subtracted.

3.Integer multiplication calculation rule: First, use the number on each bit of a factor to multiply the number on each digit of another factor, multiply the number on which digit of the factor is used, align which digit at the end of the multiplied number, and then add up the numbers obtained by each multiplication.

4.Integer division calculation rule: first divide from the high position of the dividend, the divisor is a few digits, just look at the first digits of the dividend; If it is not enough to divide, look at one more digit, and divide to which digit of the dividend, and the quotient will be written on which digit.

If any of the digits are not enough for quotient 1, "0" should be added to occupy the place. The remainder of each division should be less than the divisor. 5.

Decimal multiplication rule: first calculate the product according to the calculation rule of integer multiplication, and then see how many decimal places there are in the factor, count the number from the right side of the product, and point to the decimal point; If the number of digits is not enough, make up with a "0". 6.

The divisor is the decimal division calculation rule of an integer: first according to the rule of integer division, the decimal point of the quotient should be aligned with the decimal point of the dividend; If there is still a remainder at the end of the dividend, add a "0" to the end of the remainder and continue dividing. 7.

The divisor is a division rule for decimals: first move the decimal point of the divisor so that it becomes an integer, and the decimal point of the divisor is also moved a few places to the right ("0" if there are not enough digits), and then calculate according to the division rule that the divisor is an integer. 8.

Calculation method of addition and subtraction of fractions with the same denominator: Addition and subtraction of fractions with the same denominator, only the numerator is added and subtracted, and the denominator remains unchanged. 9.

Calculation method of addition and subtraction of different denominator fractions: first pass the score, and then calculate according to the rule of addition and subtraction of fractions with the same denominator. 10.

Calculation method with fraction addition and subtraction: the integer part and the fractional part are added and subtracted separately, and the resulting numbers are combined. 11.

The calculation rules of fraction multiplication: multiply fractions by integers, use the numerator of fractions and the product of integers multiplied as the numerator, and the denominator remains unchanged; Multiply fractions by fractions, use the product of the multiplication of the numerators as the numerator, and the product of the multiplication of the denominator as the denominator. 12.

The calculation of fraction division: The number A is divided by the number B (except 0), which is equal to the reciprocal of the number A multiplied by the number B.

Directly move the decimal point forward by two places, equals.

The decimal multiplication and division solution equation is as follows:

Multiplication and division of decimal numbers requires the decimal to be converted into an integer first, and then the hail type is calculated.

The calculation of decimal division: first move the decimal point of the divisor to make it an integer, the decimal point of the divisor is moved a few places to the right, and the decimal point of the dividend is also moved to the right by the same number of digits. Calculation rules for decimal multiplication:

First calculate the product according to the law of integer multiplication, and then see how many decimal places there are in the factor, count the number of decimal places from the right side of the product, and use 0 to make up if the number is not enough.

Multiplication of decimal numbers by integers meaning:

A simple operation to find the sum of several identical additions; The meaning of multiplying a number by a pure decimal is to find out how many tenths, hundredths, and thousandths of the number are. Decimal multiplication rule: first calculate the product according to the calculation rule of integer multiplication, and then see how many decimal places there are in the factor, count the number from the right side of the product, and point to the decimal point;

If there aren't enough digits, use 0"Complement. Decimal division, the meaning of decimal division is the same as that of integer division, that is, the operation of knowing the product of two factors and one of the factors, and finding the other factor. The divisor is the decimal division calculation rule of an integer: first according to the rule of integer division, the decimal point of the quotient should be aligned with the decimal point of the dividend;

The three ways to solve the equation are as follows:

1. Use the properties of the equation to solve the equation.

Because the equation is an equation, the equation has the properties that the equation has.

1) Add or subtract the same number from the left and right sides of the equation at the same time, and the solution of the equation remains unchanged.

2) The left and right sides of the equation are multiplied by the same non-0 number at the same time, and the solution of the equation remains unchanged.

3) The left and right sides of the equation are divided by the same non-0 number at the same time, and the solution of the equation does not change.

2. The solution of the equation of two-step and three-step operation.

The two-step and three-step equations can be calculated according to the properties of the equal royal formula, and the original equation is first converted into a one-step equation, and the solution of the equation is solved.

3. Solve the equation according to the relationship between the parts of addition, subtraction, multiplication and division.

1) Solve the equation according to the relationship between the parts in the addition.

2) Solve the equation according to the relationship between the parts in subtraction.

3) In subtraction, being decelerated = difference + subtraction.