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Authoritative PPT Summary
"Estimation" Multiplying two or three digits by one digit PPT courseware 2
Learn important and difficult points
Key points: Master the estimation method of multiplying three or four digits by one digit.
Difficulty: Make estimates based on actual life conditions.
Estimation method
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. According to the specific situation, choose the estimation method that best meets the requirements
Misunderstanding warning
Aunt Li's clothing store wants to purchase 5 cashmere coats at 1,038 yuan each. How much does Aunt Li cost approximately?
[Misunderstanding] 1038≈1000 1000×5＝5000 (yuan)
Answer: Aunt Li will bring about 5,000 yuan.
[Error analysis] The error in this question is that it is not accurately estimated based on actual life. If 1038 is regarded as 1000, the estimated result must be less than the actual amount of money.
[Correction of wrong interpretation] 1038≈1040 1040×5＝5200 (yuan)
Answer: Aunt Li will bring about 5,200 yuan.
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