Decimal multiplication by integer has the same meaning as integer multiplication. The meaning of multiplying a number by a decimal is an extension of the meaning of integer multiplication. What are the tenths, percents and thousandths of this number? □ Decimal multiplication rule: first calculate the product according to the integer multiplication rule; Look at the factor * * *, how many decimal places there are; Count a few digits from the right of the product and point to the decimal point. The decimal point of quotient should be aligned with the decimal point of dividend. □ There is a surplus at the end of the dividend. Add 0 to the remainder to continue the division. □ The divisor is expanded (or reduced) by several times (except 0), and the quotient is also expanded (or reduced) by the same times under the condition that the divisor is unchanged. □ If the divisor is expanded (or reduced) by several times (except 0), the quotient will be reduced (or expanded) by the same multiple while the divisor remains unchanged. □ The quotient of dividend and divisor is the same multiple (except 0). The approximate value of quotient generally requires dividing by one more decimal place to be reserved, and then taking the approximate value. ☆ When using the relationship between remainder and divisor to get the approximate value of quotient, there is no need to divide by one more bit. The remainder is less than half of the divisor, and the quotient of the next bit must be less than 5, so it is discarded (the remainder is regarded as an integer). The remainder is greater than half of the divisor, and the quotient of the next digit must be greater than or equal to 5. Enter 1. ☆ Write only the first cycle segment of the fractional part of the cycle. Write a dot (loop point) on the leftmost and rightmost numbers in the loop part. ☆ Comparison of cyclic decimals: First, write the decimals with the same number of digits, and then compare them. ☆ Don't write circular decimals as simple notation, write more circular knots and get approximate values as needed. ☆ Operation on the same floor shall be calculated from left to right. The secondary calculation is carried out in the order of multiplication, division, addition and subtraction. In the formula with brackets, what is in brackets is calculated first, and what is outside brackets is calculated later. ☆ When the sum of two or more numbers is divided by a number, you can divide each number in the sum by this number and then add their quotients. If the difference between two or more numbers is divided by a number, you can divide the number by the minuend and the minuend respectively, and then subtract the quotient.

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