"Approximate Values ​​of Quotient" Decimal Division PPT Courseware 3

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"Approximate Values ​​of Quotient" Decimal Division PPT Courseware 3

Oral calculation.

2.4÷ 2 = 0.56÷ 7 =

0.1÷0.05 = 0.36÷0.12 =

7.2÷0.9 = 1÷0.25 =

Use the "rounding" method to find approximate numbers:

43.9095 reserved integer is ( )

43.9095 accurate to tenths is ( )

43.9095 to two decimal places is ( )

43.9095 accurate to the thousandth is ( )

Exact and approximate numbers:

Accurate numbers: Among the numbers encountered in daily life and actual production, sometimes completely accurate numbers can be obtained. They are precise and have no errors. For example, there are 46 students in a certain class, and 46 here is the exact number.

Approximate numbers: Because in practice it is often not necessary to use precise numbers to describe a quantity, or it is impossible to obtain precise numbers. For example: China has about 1.3 billion people. The 13 here is an approximate number.

Significant digits: To which digit an approximate number is accurate, counting from the first non-zero digit on the left to this digit, all numbers are called the significant digits of this number.

For example: 0.6166≈0.62, there are two valid figures: 6, 2.

How to find the approximate value of the quotient:

To find the approximate value of the quotient, generally divide until the number of decimal places in the quotient is one more than the number of decimal places that need to be retained, and then use the "rounding" method to obtain the approximate value of the quotient.

1. Look - how many decimals or integers need to be kept in the quotient?

2. Division - divide until the number of decimal places in the quotient is one more than the number of decimal places that need to be retained.

3. Get - use the "rounding" method to get the approximate number of the quotient.

What are the similarities and differences between finding the "approximate value of the quotient" and finding the "approximate value of the product"?

The same point: both use the "rounding method" to obtain approximate values, and both look at the last digit of the reserved digit.

The difference: to find the approximate value of the product, you must first calculate the exact value of the product, and then find the approximate number. To find the approximate value of the quotient, you do not need to find the exact value of the quotient, you only need to find the next digit to be retained.

True or False

1. How many decimal places should be reserved? Divide to one more digit than the reserved digits. ( )

2. Keeping two decimal places is accurate to one tenth. ( )

3. A number with one decimal place is 5.9, and the original number must be larger than it. ( )

4. 4.998 accurate to 0.01 is 5.00, which is 5. ( )

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"Approximate Values ​​of Quotient" Decimal Multiplication and Division PPT Courseware 2:

"Approximate Values ​​of Quotient" Decimal Multiplication and Division PPT Courseware 2 1. Calculate the following questions orally. 0.3+0.77= 0.50.5= 0.1-0.01= 1000.06= 0.213= 4.30.02= 0.3510= 0.8+5.2= ... ... ... Practice 1. Determine whether to use the further method or the next method for each of the following questions. .

"Approximate Values ​​of Quotient" Decimal Multiplication and Division PPT Courseware:

"Approximate Values ​​of Quotient" decimal multiplication and division PPT courseware uses the rounding method to find approximate numbers: 43.9095 Keeping the whole number is ( ) 43.9095 Accurate to the tenth place is ( ) 43.9095 Keeping two decimal places is ( ) 43.9095 Accurate to the thousandth place is ( ) Accurate number..

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Update Time: 2024-09-07

This template belongs to Mathematics courseware Western Normal University Edition Fifth Grade Mathematics Volume 1 industry PPT template

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