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Category | Format | Size |
---|---|---|
Jiangsu Education Edition Fifth Grade Mathematics Volume 1 | pptx | 6 MB |
Description
"Finding the approximate number of a decimal" The meaning and properties of decimals PPT courseware 2
1. Rewrite the following numbers into numbers using "ten thousand" or "hundred million" as the unit.
80000 = ( ) 280000 = ( )
1200000000=( )
10700000000=( )
2. Omit the mantissa after the ten thousand digit to find an approximate number
63599≈ ( )10,000 709327≈ ( )10,000
637000≈( )10,000 89673 ≈ ( )10,000
Finding the approximate number of a decimal is similar to finding the approximate number of an integer. Both can retain a certain number of decimal places according to the "rounding" method.
When finding approximate numbers:
Keep an integer, which means it is accurate to one place; keep one decimal place, it means it is accurate to tenth place; keep two decimal places, it means it is accurate to hundredth place...
Notice:
1. Take an approximate value according to the requirements of the question. If you want to keep an integer, look at ________; if you want to keep one decimal place, look at ________;...and then press ________ to decide whether to round or round.
2. When taking approximate values, among the decimal places retained, 0________ at the end of the decimal.
Find the approximate number of the following decimals.
(1) Keep two decimal places
0.256 12.006 1.0987
(2) Accurate to tenth place
3.72 0.58 9.0548
Rewrite the number as "ten thousand" or "hundred million" as the unit:
1. Classification;
2. Point the decimal point;
3. Remove the 0 at the end of the decimal;
4. Write the word "ten thousand" or "hundred million".
1. Find the approximate number of the following decimals.
(1) Rewrite 24800 into a number using "ten thousand" as the unit.
(2) Rewrite 34528600000 into a number using "100 million" as the unit. (keep one decimal place)
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"Finding the Approximation of a Decimal" PPT courseware on the meaning and properties of decimals:
"Finding the Approximate Number of a Decimal" PPT courseware on the meaning and properties of decimals Doudou is about 0.98 meters tall. Doudou is about 1 meter tall. To find the approximate number of an integer, you can use the rounding method. To find the approximate number of a decimal, you can also use the rounding method. If you keep to two decimal places...
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Update Time: 2024-10-16
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