"Approximate Value of Product" Decimal Multiplication PPT Courseware 2

Description

"Approximate Value of Product" Decimal Multiplication PPT Courseware 2

teaching objectives

1. Master the method of calculating the approximate value of the product, and be able to understand the meaning of the approximate value according to the actual situation.

2. Can use the original experience of finding approximate decimal numbers to actively learn the approximate value of product.

3. Through analysis, discussion and other methods, further understand the meaning of the approximate value of the product.

Oral calculation.

0.8×4= 0.32×2= 0.8×12.5=

7.8×0.01= 3.2×0.2= 0.08×0.08=

9.3×0.01= 8.42×5.8= 4.8×0.48=

learn new lessons

In real life, the product obtained by multiplying decimals often does not need to retain many decimal places. In this case, the "rounding method" can be used to retain a certain number of decimal places as needed to find the approximate value of the product.

Observe the pictures carefully and talk about the quantitative relationship in this question.

Unit price × quantity = total price

Think about it: How should I formulate the formula?

1.75×8.5=14.875 (yuan)

Think about the answer:

1. What is the smallest unit of RMB?

2. Which digit represents "cent" in a decimal unit of yuan?

3. How many decimal places does the product we calculate have?

4. What should I do if I want to be precise?

5. So what should the final result be?

summary:

In real life, the product obtained by multiplying decimals often does not need to retain many decimal places. In this case, an approximate value can be obtained according to needs or question requirements.

The general method for obtaining approximate values ​​is: to keep one decimal place, look at the second decimal place; to keep two decimal places, look at the third decimal place... and then use the "rounding method" to make the decision.

Keywords: multiplication of decimals courseware, approximation of products courseware, Western Normal University edition fifth grade mathematics volume PPT courseware download, fifth grade mathematics slide courseware download, multiplication of decimals PPT courseware download, approximation of product PPT courseware download, .PPT format;

For more information about the "Approximate Values ​​of Products of Multiplication of Decimals" PPT courseware, please click on the Approximate Values ​​of Products of Multiplication of Decimals ppt tag.

"Approximate Value of Product" Decimal Multiplication PPT Courseware 4:

"Approximate Values ​​of Products" Decimal Multiplication PPT Courseware 4 Teaching Objectives 1. Combined with specific examples, experience the process of independently solving problems and expressing the results with approximate numbers. 2. Further master the calculation method of decimal multiplication; be able to use the rounding method to find the approximate value of the product. 3. Feel...

"Approximate Values ​​of Products" Decimal Multiplication Flash Animation Courseware:

"Approximate Values ​​of Products" Decimal Multiplication Flash Animation Courseware This courseware is a teaching material Flash animation courseware for decimal multiplication in the second unit of the fifth grade mathematics volume of the Hebei Education Edition. The content is vivid and vivid, please download it! Keywords: Teaching courseware for decimal multiplication, teaching approximation of products..

"Approximate Value of Product" Decimal Multiplication PPT Courseware 3:

"Approximate Value of Product" Decimal Multiplication PPT Courseware 3 Teaching Objective: To enable students to use the rounding method to intercept the approximate value of a decimal when the product is a decimal. Key point: The approximation of the quadrature can be correct according to actual needs. Difficulty: Flexibly use rounding to obtain approximate values. Study method: alone..

File Info

Update Time: 2024-09-06

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

Preview