"Energy Saving and Emission Reduction" PPT Courseware 2

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"Energy Saving and Emission Reduction" PPT Courseware 2

1. Situation introduction

One faucet saves 10ml of water per minute.

Each family saves 50 yuan per year on electricity bills.

How many milliliters of water can a water-saving faucet save in 2 minutes?

What mathematical information do you know from the picture?

2. Cooperation and exploration

How many milliliters of water can a water-saving faucet save in 2 minutes? 3 minutes, 4 minutes...

Can you use a formula to succinctly express the amount of water saved at any time?

Which one is more concise and clear?

In mathematics, we often use letters to represent numbers. Usually the letter t is used to represent time, and the water saving amount in t minutes is expressed as 10×t.

3. Independent practice

1. Look at the picture and fill in the blanks

2. Fill in the blanks according to the meaning of the question.

Buses can travel a kilometer per hour, and cars can travel 20 kilometers more per hour than buses.

(1) a+20 means: _________.

(2) The number of kilometers traveled by the bus in 2 hours: _________.

(3) The number of kilometers traveled by a car in 5 hours: _________.

3. Write the calculation correctly.

4. Can you tell what each expression means?

①m-n: Indicates how many kilograms a basket of bananas weighs more than a basket of apples.

②m+n: Indicates how many kilograms a basket of bananas and a basket of apples weigh in total.

③4m: Indicates the total weight of 4 baskets of bananas in kilograms.

④m+2n: Indicates how many kilograms the total weight of 1 basket of bananas and 2 baskets of apples is.

5. Count frogs

6. Can you tell a mathematical story using equations containing letters?

(1) There were x people on a bus, and 5 people got off when it arrived at the bus stop. How many people are left on the bus now?

(2) There are m glutinous rice balls in the pot, and each plate can hold 10 glutinous rice balls. How many plates are needed to hold these glutinous rice balls?

The first person to systematically use letters to represent numbers

Do you know who was the first person to consciously and systematically use letters to represent numbers? He was the French mathematician Veda. Veda devoted his life to the study of mathematics and made many important contributions, becoming the greatest mathematician of his era. Since the Vedic system used letters to represent numbers, it has led to a large number of mathematical discoveries and solved many complex problems of ancient times.

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For more information about the "Energy Saving and Emission Reduction" PPT courseware, please click on the Energy Saving and Emission Reduction ppt tab.

"Energy Saving and Emission Reduction" PPT courseware 5:

"Energy Saving and Emission Reduction" PPT Courseware 5 A water-saving faucet can save 10 milliliters of water per minute. How many milliliters of water can a water-saving faucet save in 2 minutes? 3 minutes, 4 minutes, you know? When writing expressions containing letters: ① When multiplying numbers and letters, the multiplication sign can be written as , or...

"Energy Saving and Emission Reduction" PPT courseware 4:

"Energy Saving and Emission Reduction" PPT courseware 4 1. Scenario introduction The electric car traveled 60 kilometers per hour for 2 hours. How many kilometers have you traveled? What mathematical information do you know from the picture? 2. Collaborative Exploration How many kilometers have you traveled? The request has been processed..

"Energy Saving and Emission Reduction" PPT Courseware 3:

"Energy Saving and Emission Reduction" PPT courseware 3 1. Scenario introduction A faucet saves 10 ml of water per minute. Each family saves 50 yuan per year on electricity bills. How many milliliters of water can a water-saving faucet save in 2 minutes? What mathematical information do you know from the picture? 2. Cooperate to explore water-saving faucets..

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Update Time: 2024-11-17

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

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