What is the concept of approximation and what does the concept of approximate number refer to?

It is impossible for two identical shapes in nature, but there are many approximate shapes: for example, the leaves of the same plant, the pebbles in the stream, the wind-blown sand dunes, etc., are all similar in shape. Approximation in plane composition refers to the basic shape composition picture that has common characteristics in shape, size, color, texture, etc., and presents a vivid and changing effect in unity.

The degree of approximation can be large or small, but if the degree of approximation is large, there will be a sense of repetition; If the degree of approximation is too small, the sense of unity will be destroyed and the approximate meaning will be lost. In short, the approximate composition in the plane composition should give the impression that the basic shapes are in a homogeneous relationship.

Images that are different from the same or similar with the same can be called similar images. The so-called approximation is only comparative. Therefore, when using approximation, it is necessary to pay attention to whether the degree of approximation is appropriate.

For approximation, the morphological aspect should be considered first, and then the size, color texture and other factors should be considered.

Approximation: Similar but not identical.

Example: Two people who are similar to each other.

It's so troublesome. I think that's about the same thing.

An approximate number is a number that is close to an exact number. An approximate number is a number that is not much different from the original data obtained by rounding, advancing or removing the tailing.

A number that is close to an exact number is called an approximate number. An exact number is the original data of the number, which has not been expressed before any operations such as reduction, simplification, or rounding. An approximate number is a number that is not much different from the original data obtained by rounding, advancing or removing the tailing.

The law of addition and subtraction of approximate numbers:(1) Determine which digit the calculation result can be accurate to.

2) "Round" the mantissa of a known number that exceeds this digit to the next digit of this digit.

3) Do the math and round the last digit of the calculated number.

Multiplication and division of approximate numbers:

1) Determine how many significant figures there are in the result.

2) Round up the number of significant figures in the known numbers to only one more than the number needed in the result.

3) Perform the calculations and "round" the calculated numbers to the number of significant figures.

The definition of an approximate number in mathematics refers to a number that is close to an exact number, slightly more or less than an exact number. An approximate number is accurate to the digit, which means keeping the number from the first non-0 number on the left to the exact digit.

It is difficult or unnecessary to express the quantity in life with an exact number, but it is approximated by a rational number, and we call this rational number an approximate number of this quantity. For example, the length of the Yangtze River is about 6300km, and 6300km here is an approximate number.

How to find the approximate number

1. Rounding method.

The most commonly used method of finding the approximate number is mainly to see that the mantissa it omits is 4 or more than 4 hours, and then round off the mantissa number; If the number in the highest digit of the omitted mantissa is 5 or greater than 5, the mantissa number should be omitted and the previous digit should be advanced by one.

2. Advance a method.

If students go rowing, each boat can carry up to 6 students, how many boats do 39 students need? 39 6=, that is, 39 students need 6 boats and 3 people remain, and these 3 people need one boat, so a total of 7 boats are needed, that is, 39 6 = only).