83 8 0 84 How many decimal places are kept?

Vertical calculations,.

Vertical Calculation - Division Operation: When we calculate the division operation, try to choose that both the dividend and the divisor are integers. If there is a decimal between the dividend and the divisor, it can be calculated as an integer.

When calculating, you should divide and remove the number from the high position of the dividend, get the quotient, keep the remainder, and then calculate in the next step. If it is an infinite loop decimal place, it can be calculated to a few decimal places as required.

The detailed calculation process is as follows.

Step 1: 838 84 = 9, remaining 82

Step 2: 820 84 = 9, remaining 64

Step 3: 640 84 = 7, remaining 52

Step 4: 520 84 = 6, remaining 16

So we can calculate the remainder of the answer by dividing the vertical calculation above, so if we want to keep one decimal place, we can get the answer is.

Calculation: Vertical calculation - multiplication operation: When calculating the vertical calculation multiplication operation, first calculate the first digit of one digit multiplied by another digit, and then calculate the multiplication of the other digit from the low to the high digit in turn, and finally add up the obtained answers to get the final answer.

We can go through the above calculation process and get the calculated answer is correct.

Follow the rounding method.

Keeping one decimal place for the answer is approximately equal to.

Keep two decimal places approximately equal to.

Keep two decimal places: Look at the third decimal place, for example, keep two decimal places, that is, see 6, 6 is greater than 5, go forward one place, that is, the answer is. An approximate number is a number that is close to an exact number.

For example, if the population of our country is 1.3 billion, 1.3 billion is an approximate number.

Numbers that are close to the actual number, but do not match exactly, are called approximate numbers. For approximate wide and late scales, it is often necessary to know its accuracy. The accuracy of an approximate number is usually expressed in two ways: rounding.

An approximate number is rounded to which digit it is, and the approximate number is said to be exact. In addition, there are two methods: one and one tail.

It is expressed in terms of the number of significant figures. Rounded approximate numbers, starting with the first non-zero number on the left and ending with the last digit, all digits are called significant digits of the number.

Finding Approximate Numbers Keeping Significant Figures Rounding Rules Carefully:

1) When the n significant digits are retained, if the following digits are less than the nth digit of the unit number, it will be discarded.

2) When the god retains the n-digit significant digit, if the following number is greater than the n-digit unit digit of caution, the first digit will be advanced to 1.

3) When the n-digit significant digit is retained, if the following digit is exactly the nth digit unit number, if the n-digit digit is even, the following digit will be discarded, if the n-digit digit is an odd number plus 1.

In the absence of special requirements, rounding is generally used to find the approximation.

To ask the quotient to keep three decimal places, at least the first four decimal places of the quotient must be calculated, and then the fourth decimal place after the decimal point should be rounded.

The required three decimal places are:

If only three decimal places are kept, the fourth place of 4 has been rounded.

According to the principle of rounding, the quotient, retaining two decimal places of Liang search is a leak of the oak family;

First calculate 1000, and then according to the rounding rule, the imitation of the ant Sun left two decimal places in the chain is equal to.

1000 results are preserved to two decimal places.

According to the principle of rounding, keep 2 decimal places, that depends on whether the third decimal is greater than equal to 5, because the third digit of the eggplant is 5, to advance one place, so:

Approximately equal to Lao Lap to keep two decimal places). Trembling and.

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As a result, the preservation and the ant rock left a decimal place is.

Leave one decimal place after that.

The result of keeping one decimal place is.

The exact result is that 6 big bi mo in 5, then the forward silver number is forward, the number of the front is advanced by 1, and after entering 1, it is added to 10 with 9, and then it is 1 forward.

If only one small closed line Kai number is retained, and the sedan car is rounded to 3, then there is only a cluster.