"Visiting the Three Gorges" PPT courseware 7

Description

"Visiting the Three Gorges" PPT courseware 7

1. Overall review

Decimal multiplication

Multiply decimals by whole numbers

Multiply decimals by decimals

product approximation

Simple calculations for decimal multiplication

decimal division

Decimal divided by whole number

Decimal divided by decimal

Approximate value of quotient

recurring decimal

Mixed decimal arithmetic

2. System sorting

Decimal multiplication:

When calculating decimal multiplication, you can first calculate by integer multiplication, and then determine the number of decimal places in the product based on the number of decimal places in the factors.

Simple operation of decimal multiplication:

Use simple methods to calculate the following questions.

0.6×2.5×0.5×4

=(0.6×0.5)×(2.5×4)

=0.3×10

=3

The same arithmetic laws for integers apply to decimals.

Decimal division:

Divisor is the division of decimals. First, convert the divisor into an integer, and then calculate it by dividing the decimal by an integer.

3. Comprehensive application

1. Answer quickly.

Known: 25 × 16 = 400

Then: 2.5 × 0.16 = ( )

2.5×1.6＝( )

0.25×0.16＝( )

Known: 256 ÷16 = 16

Then: 25.6 ÷ 16 = ( )

0.256 ÷ 0.16＝( )

0.256 ÷ 1.6＝( )

5. (1) Xiaofang bought 2.5 kilograms of bananas for a total of 9 yuan. How much does a kilogram of banana cost on average?

9÷2.5 = 3.6 (yuan)

Answer: The average price of bananas is 3.6 yuan per kilogram.

(2) Teacher Zhang bought 4.08 kilograms of bananas. How much did it cost in total?

3.6×4.08≈14.69 (yuan)

Answer: It cost 14.69 yuan in total.

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Update Time: 2024-11-22

This template belongs to Mathematics courseware Qingdao Edition Fifth Grade Mathematics Volume 1 industry PPT template

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