"Estimation" PPT courseware for large numbers in life

Description

"Estimation" PPT courseware for large numbers in life

teaching objectives

1. Combined with the problem of purchasing electrical appliances, go through the process of addition and subtraction estimation of numbers within ten thousand.

2. Be able to estimate addition and subtraction, and initially learn to use language to describe the calculation process and results.

3. Experience the application of estimation in life, cultivate estimation awareness, and accumulate life experience.

Estimate: How much does it cost to purchase the following cell phones and cameras?

1280≈1300 3240≈3200

1280＋3240≈ 4500 (yuan)

Xiao Ming's family is a professional breeding household.

(1) How much is the total of these two incomes?

1366≈1400 1132≈1100

1366+1132 ≈ 2500 (yuan)

(2) How much is the difference between Xiaoming’s income from raising ducks and raising chickens?

1366≈1400 1132≈1100

1366-1132 ≈ 300 (yuan)

In conclusion

1. Estimation of addition: First treat the two addends as approximate numbers that are close to the exact number, and then perform calculations.

2. Estimation of subtraction: First treat the minuend and subtrahend as approximate numbers that are close to the exact number, and then perform calculations.

practice

1. Estimate the following questions.

2. (1) Purchase any two items from the following products and estimate how much it will cost.

(2) Ask and answer subtraction estimation problems yourself.

3. Without counting, can you tell which fruit has the most?

4. Xiaohua’s grandfather is old and has difficulty leaving. Her mother plans to buy her grandfather a handcart. The price of the handcart ranges from 500 yuan to 750 yuan, but her mother only brought 380 yuan. Do the math:

(1) How much money does mother need to withdraw at least?

(2) How much more yuan can the mother withdraw at most?

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For more information about the "Estimating Large Numbers in Life" PPT courseware, please click the "Estimating Large Numbers in Life ppt" tag.

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File Info

Update Time: 2024-11-22

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

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