1, approximate value of mathematical product
Approximation of mathematical product refers to simplifying calculation or providing estimation results by replacing exact answers in multiplication with close numerical values. Approximation number is widely used, which can be used for rapid calculation and estimation in daily life, and also has important application value in science, engineering and other fields.
2. Calculation method of divisor
(1) Rounding: Rounding is a common method to calculate the divisor. In the rounding method, whether to discard or carry is decided by judging the size of the next digit after the decimal point. When the next digit is greater than or equal to 5, carry; When the next number is less than 5, it is discarded. 2.56 is rounded to get 2.6.
(2) Truncation: Truncation refers to directly discarding the part after the decimal point, and only retaining the integer part or decimal places. Truncation is usually used when the result is required to be accurate to a certain number of digits. The truncation of 2.56 leaves a decimal place, and the result is 2.5.
(3) Scientific notation: Scientific notation is a method to express the maximum or minimum decimal, which is expressed by a coefficient and an index with 10 as the base. In scientific notation, the coefficient is generally between 1 and 10, and only one decimal place is reserved. 100000 can be expressed as 1.0× 10 5 by scientific notation.
Three application scenarios of divisor
1, estimation of practical problems
When solving practical problems, approximation can help to estimate the results quickly. Calculate the total price when shopping, estimate the time required for the trip, etc.
2. Simplification of complex calculation
Some multiplication operations can be very complicated. Using approximation can simplify the calculation process and reduce the error probability. Processing of large-scale data in scientific calculation.
3. Data processing and statistical analysis
In data processing and statistical analysis, similarity number is helpful to quickly estimate the changing trend and approximate results of data.