"Estimation" Multiplying two or three digits by one digit PPT courseware

Description

"Estimation" Multiplying two or three digits by one digit PPT courseware

teaching objectives

1. Combined with the specific situation, go through the process of independently selecting appropriate units for simple multiplication estimation.

2. Be able to choose appropriate units to solve simple multiplication estimation problems in life, and be able to estimate three-digit numbers multiplied by one-digit numbers.

3. In the process of using estimation to solve real-life problems, understand the role of estimation in life.

review review

The Yangtze River is the longest river in my country, about 6,299 kilometers long, which is 835 kilometers longer than the Yellow River. How many kilometers is the Yellow River approximately?

6299≈6300 835≈800

6299-800≈5500 (km)

The school organized 293 students to visit the science and technology exhibition.

Let’s estimate: How much does it cost to buy tickets?

293≈300 293×5≈1500 (yuan)

Answer: It costs about 1,500 yuan to purchase tickets.

Uncle Wang planted tomatoes in 4 greenhouses and sold tomatoes in one greenhouse for 1,052 yuan.

method one

1052≈1000 1052×4≈4000 (yuan)

Answer: Tomatoes from four greenhouses can be sold for a total of 4,000 yuan.

Method Two

1052≈1050 1052×4≈4200 (yuan)

Answer: Tomatoes from four greenhouses can be sold for a total of 4,200 yuan.

In conclusion

Estimation method for multiplying three or four digits by one digit: first treat the three or four digits as the closest hundreds or thousands to them, and then use verbal arithmetic to calculate the approximate result; or use the "rounding" method Omit the numbers in their units digits, multiply by the one-digit number, and calculate the result orally. Depending on the specific situation, choose the estimation method that best meets your requirements.

practice

1. Estimate the following questions.

2. Wang Xiaoli rides a bicycle to school every day.

(1) How many meters can Wang Xiaoli ride in 6 minutes?

(2) Wang Xiaoli’s home is 1,600 meters from the school. Can she reach the school in 8 minutes by bike?

3. The stands of an indoor stadium are divided into 8 areas, each with 61 seats.

(1) Approximately how many seats does this stadium have?

(2) Are there enough seats for 500 people to watch a sports match?

4. Aunt Li picked 517 apples from an apple tree. Let’s estimate: How many apples can Aunt Li’s orchard pick?

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"Estimation" Multiplying two or three digits by one digit Flash animation courseware:

"Estimation" Flash animation courseware for multiplying two and three digits by one digit. This courseware belongs to the second unit of the third grade mathematics volume of Hebei Education Edition. It is a teaching material for estimating Flash animation courseware for multiplying two and three digits by one digit. The content is vivid and vivid. Please download! Keywords: Multiply two or three digits by one..

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Update Time: 2024-06-29

This template belongs to Mathematics courseware Hebei Education Edition Third Grade Mathematics Volume 1 industry PPT template

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