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"Approximate Numbers of Decimals" Decimal PPT Courseware 2
What is the approximate number of 2.953 to two decimal places?
2.953≈2.95
To retain two decimal places, the mantissa after the hundredth place must be omitted, and the thousandth place determines the rounding.
Think about it:
0.984≈____(retain integer)
When finding approximate numbers:
Keep integers, indicating accuracy to single digits;
With one decimal place, the accuracy is to the tenth place; with two decimal places, the accuracy is with the hundredth place...
Find the approximate number of the following decimals.
(1) 0.256 12.006 (round to two decimal places)
(2) 7.816 13.974 (round to one decimal place)
(3) 1.234 25.519 (retain integers)
Discuss:
(1) 2.953 with one decimal place is 3.0. Can the 0 at the end of the decimal be removed? Why?
(2) Comparing the approximate numbers 3.0 and 3, which one is more accurate and why?
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"Approximate Numbers of Decimals" Decimal PPT Courseware 3:
"Approximate Numbers of Decimals" Decimal PPT Courseware 3 Review: 1. Omit the mantissa after the ten thousand digit of each of the following numbers and find their approximate numbers. 986534 58741 31200 50047 398010 Think about it: How to approximate an integer? 2. Which of the following can be filled in?