"Multiplying Decimals by Decimals" Decimal Multiplication PPT Courseware

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"Multiplying Decimals by Decimals" Decimal Multiplication PPT Courseware

Compare the two calculations, what are the similarities and differences?

Only one factor of 3.1×12 is a decimal; while both factors of 3.1×1.2 are decimals.

Group discussion and collaborative problem solving:

Can multiplying decimals by decimals be solved in a similar way to multiplying decimals by integers?

3.1×1.2 is expanded by a certain multiple and converted into an integer to multiply 31×12

The product of decimals is the product of reducing the same multiple and converting it into a multiplication of decimals. The product of integers is

Find the pattern:

Students, if we are calculating a decimal multiplied by a decimal, would it be a bit troublesome if we think about how many times the factors have been expanded in each question, and then reduce the corresponding multiples to get the original product? Are there any rules here? Let's go look for it.

The sum of the decimal places of two factors is equal to the decimal places of the product.

How to calculate decimal times:

When multiplying decimals by decimals, first calculate by multiplying integers. Then look at how many decimals there are in the factors. Count the number from the right side of the product and put the decimal point.

Oral calculation

0.7×0.8＝ 2.5×0.4＝

2.3×0.3＝0.05×2＝

1.7×0.5＝ 1.25×0.8＝

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"Multiplying Decimals by Decimals" Decimal Multiplication Flash Animation Courseware 2:

"Multiplying Decimals by Decimals" Multiplying Decimals Flash Animation Courseware 2 This courseware is a teaching material 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: decimal multiplication teaching courseware,...

"Multiplying Decimals by Decimals" Decimal Multiplication PPT Courseware 4:

"Multiplying Decimals by Decimals" Decimal Multiplication PPT Courseware 4 Teaching Objectives 1. Combined with specific examples, experience the process of using existing knowledge to solve problems and learn the calculation method of multiplying decimals by decimals. 2. Understand and master the calculation methods of decimal multiplication, and be able to correctly multiply decimals..

"Multiply decimals and their estimation" Decimal multiplication PPT courseware 2:

"Multiply decimals by decimals and their estimation" Decimal Multiplication PPT Courseware 2 Tell us how many decimals the following product is: 0.194.2 5.161.3 6.370.28 24.63.2 Calculate each of the following questions orally: 0.63 490.1 80.125 500.3 3.770 1.60.2 30.254 7.60.8+0.27..

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Update Time: 2024-10-15

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

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