### What is the method of retaining two decimal places?

Retaining two decimal places means that when a number is taken as an approximation, the first two digits after the decimal point are retained and the third digit is rounded up. For example, 1.0023 is 1.00 if two decimal places are retained.

The least significant digit is the percentile, and a zero is added directly after the digit that is not enough, for example, 2.3 = 2.30.

Retaining two decimal places is a method of converting an approximate number, and the converted value is similar to the exact number value.

The homotypic algorithm

Rounding four to five is a counting retention method for accuracy. Here, “four” is less than five means, “six” is more than five means, “five” is the rounding bit after the tail number of five words look at the previous one, odd into even not into. Such as 1.25 to keep a decimal, because 2 is even, so is 1.2. and 1.35, because 3 is odd, so is 1.4.

From a statistical point of view, “rounding up to five double” than “rounding up to five” to be scientific, which makes the result of rounding up some of the results of the larger, some of the smaller, more average. Instead of rounding up to five, which leads to results in favor of large numbers.

### How to keep two decimal places

Take two digits directly after the decimal point and round the third digit.

Retaining two decimals is not the same as retaining two digits, e.g., 1.0023, retaining two decimals is 1.00, retaining two digits is 1.0. Valid digits refer to the numbers in a number from the first non-zero digit of the number up to the end digit is called a valid digit, e.g., there are three valid digits of 0.618, which are 6, 1, and 8.

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Methods of retaining valid numbers

(1) When retaining n valid numbers, if the n+1th digit ≤ 4 is rounded off.

(2) When retaining n valid numbers, if the n+1st digit ≥ 6, then the nth digit is rounded up to 1.

(3) When retaining n valid numbers, if the n+1st digit = 5 and followed by any digit of 0, then the nth digit is rounded up to the next digit if it is an even number, and 1 is added to the next digit if the nth digit is an odd one; if the n+1st digit = 5 and followed by any digit which is not 0, then whatever the nth digit is, then the next digit is rounded down to 1; if the n+1st digit = 5 and followed by any number not 0, then whatever the nth digit is, then the next digit is rounded down to 1. If the n+1th digit = 5 and there is any digit after it that is not 0, then 1 is added regardless of whether the nth digit is odd or even.

### Retain two decimals how to retain?

Valid numbers are counted from the first number on the left that is not 0. For example, 1.0023, retaining two valid numbers would be 1.0, and the first number that is not 0 starts to take two, and this is the practice for decimals where the integer is not 0. It is different when the integer is 0.

For example: 0.0123, retain two decimal, then 0.01, the third decimal rounded. When two valid digits are retained, which can only be done by multiplying powers, it should be represented as 1.2 x 10^(-2), with -2 in parentheses being the -2nd power.

Rounding rules for valid numbers:

1. When n valid numbers are retained, if the n+1st digit is ≤ 4 it is rounded off.

2. When retaining n valid digits, if the n+1th digit ≥ 6, then the nth digit into 1.

3. When retaining n valid digits, if the n+1st digit = 5 and the number of digits behind the 0, then the nth digit if the number is an even number of digits will be rounded off the number of digits behind the nth digit if the nth digit of the number is an odd number of digits, plus 1; if the nth digit = 5 and behind the number of digits behind the number of digits that are not 0, regardless of the nth digit of any number of digits. If the n+1th digit = 5 and there is any number that is not 0 after it, 1 will be added regardless of whether the nth digit is odd or even.

### How do you keep two decimals with a decimal point?

15 ÷ 6.2 two decimal places:

First, expand the divisor by 10 times and remove the decimal point to make it a whole number.

The divisor is also expanded 10 times at the same time.

Expansion

Vertical calculations:

Addition:

Same number of digits are aligned, if the sum is more than 10, go forward by 1.

Subtraction:

Same number of digits are aligned, if it is not enough to subtract the sum, go forward by 1 to get 10.

Multiplication:

Multiply the number in the i-th digit of one digit by the j-th digit of another digit.

To multiply a number in the j-th digit of another digit by the j-th digit of another digit. Multiplication:

The i-th digit of a number multiplied by the j-th digit of another number

should be added to the i+j-1 digit of the product.

Division:

If 42 is divided by 7.

Divide from 4 [high to low]. When division is done in the vertical formula, divide from the highest place, e.g., 42 is divided from the highest tens place, 4; if it is not possible to divide, e.g., 4 is not divisible by 7, then the highest place and the next place are combined into a single number to be divided until it is possible to divide the divisor; e.g., if 4 is not divisible by 7 in 42 dividing by 7, 4 and 2 are combined into a single number 42 to be divisible by 7, and the quotient is 6.

### How to keep 2 decimal places

There are many ways to keep two decimal places, for example, the result of the calculation is 2089.984

Rounding method: 2089.98. If the third decimal place is greater than or equal to 5, then round off the third and the subsequent data, and add one to the second decimal place; otherwise, round off the third and the subsequent decimals, and the second decimals remain unchanged.

Forward by one: 2089.99. If the third decimal is greater than 0, then the third and subsequent digits are discarded and the second decimal is added by one

Deletion: 2089.98. No matter what happens to the third and subsequent digits, otherwise, the third and subsequent digits are discarded and the second decimal remains unchanged.

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