"Approximate Values of Product" Decimal Multiplication and Division PPT Courseware

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Jiangsu Education Edition Fifth Grade Mathematics Volume 1	pptx	6 MB

"Approximate Values of Product" Decimal Multiplication and Division PPT Courseware

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Upload Time: 2024-11-18

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"Approximate Values of Product" Decimal Multiplication and Division PPT Courseware

1. Oral calculation.

1.2×0.3= 0.7×0.5=

0.21×0.8= 1.8×0.5=

1.25×8= 0.11×0.6=

1.3+0.74= 1�0.82=

Let’s summarize:

When calculating the amount of money, usually keep it to cents. Even if it is not required in the question, you should keep two decimal places.

When finding the approximate number of the product, first clarify the number of decimal places to be retained, then look at the number that is one more than the number of decimal places to be retained, and use the "rounding" method to intercept the approximate number of the product.

practice

1. The approximate value of the product of two factors to two decimal places is 3.58. Which of the following numbers might the exact value be?

3.509 3.578 3.574 3.583 3.585

The exact value is probably 3.578.

The exact value may also be 3.583.

2. Distinguish between right and wrong.

(1) 1.36 to one decimal place is approximately equal to 1.3.

(2) 1.015 can be written as 1.0 or 1 after retaining one decimal place.

(3) 14. ( )≈14, the number in ( ) can be 1, 2, 3, 4, or 5.

(4) When calculating the amount of money, three decimal places are usually retained.

If you use "rounding" to take the product, the approximate number is 5.1 meters, but this is not enough to make 16 flowers. In this case, regardless of whether the highest digit of the mantissa is more than 5 or less than 5, the previous digit must be advanced by one.

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For more information about the PPT courseware "Approximate values of multiplication and division of decimals and multiplication of products", please click the Approximate values of multiplication and division of decimals ppt ppt tag.

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Update Time: 2024-11-18

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"Approximate Values of Product" Decimal Multiplication and Division PPT Courseware