"My family bought a new house" PPT courseware 5

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"My family bought a new house" PPT courseware 5

learning target:

1. Be able to distinguish the perimeter and area of ​​rectangles and squares.

2. Be proficient in mastering and using the formulas for the perimeter and area of ​​rectangles and squares to solve practical problems.

3. Cultivate a love for life.

Key Points: Calculate perimeter and area.

Difficulty: The difference between perimeter and area.

How much does it cost to buy plaster molding and wooden flooring?

How much does it cost to buy gypsum wire? As shown in the picture above, you need to first find the perimeter of the rectangular ceiling. Please tell me how much it cost to buy gypsum wire.

I calculate it like this;

According to: Perimeter of rectangle = (length × width) × 2

Know the perimeter of the ceiling: (5×4)×2=18 (meters)

How much did it cost to buy gypsum wire: 12 × 18 = 216 (yuan)

Answer: It cost 216 yuan to buy gypsum wire.

To find out how much it cost to buy the wooden floor, you must first find the area of ​​the rectangular ground, and then find out how much it cost to buy the wooden floor.

I calculate it like this:

According to: Area of ​​rectangle = length × width

(5×4)=20(square meters)

85×20=1700 (yuan)

Answer: It cost 1,700 yuan to buy wooden floor.

Summary: The difference between perimeter and area:

Difference Perimeter

Concept The length of a week of a closed figure

Calculation method Perimeter of rectangle = (length + width) × 2

Perimeter of a square = side length × 4

Units of measurement: kilometers, meters, decimeters, centimeters, millimeters

Conversion relationship 1 kilometer (km) = 1000 meters (m)

1 meter = 10 decimeters (dm)

1 decimeter = 10 centimeters (cm)

area

Concept The size of a closed graph surface

Calculation method Area of ​​rectangle = length × width

Area of ​​a square = side length × side length

Units of measurement square meters, square decimeters, square centimeters

Conversion relationship: 1 square meter (m2) = 100 square decimeters (dm2)

1 square decimeter = 100 square centimeters (cm2)

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Update Time: 2024-10-19

This template belongs to Mathematics courseware Qingdao Edition Third Grade Mathematics Volume 2 industry PPT template

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