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Authoritative PPT Summary
"Traveling to the Three Gorges" PPT courseware 4
1. Situation introduction
There are 8 pieces of bacon in a box and cost 97 yuan.
How much does each piece of bacon cost on average?
I bought 6 boxes of tea and spent a total of 350 yuan.
How much does each box of tea cost on average?
What mathematical information do you know from the picture?
What questions can you ask based on this information?
2. Cooperation and exploration
How much does each piece of bacon cost on average?
97÷8≈
In general, "rounding" is used to find the approximate number of the quotient.
When calculating the amount of money, usually two decimal places or one decimal place is used to express the accuracy to cents or dimes.
How to find the approximate value of the quotient?
In general, the "rounding method" is used to find the approximate value of the quotient.
Round to two decimal places: 97 ÷ 8 =12.125 ≈ 12.13 (yuan)
Round to one decimal place: 97 ÷8 ≈ 12.12≈ 12.1 (yuan)
Keep integers: 97 ÷ 8 ≈ 12.1 ≈ 12 (yuan)
3. Independent practice
1. Calculate each of the following questions (keep the result to one decimal place).
18.9÷2.3≈8.2 24.5÷0.65≈37.7
5.41÷3.7≈1.5 43÷13≈3.3
3.7÷0.12≈30.8 2.5÷24≈0.1
2. Use the "rounding method" to find the approximate value of the quotient and fill in the following table.
3. (1) How many times the speed of a swordfish is that of a shark?
(Round to one decimal place)
130÷40≈3.3
Answer: The speed of swordfish is about 3.3 times that of shark.
(2) What other questions can you ask?
How many times faster is a fin whale than a sperm whale? (Round to one decimal place)
50÷22≈2.3
Answer: The speed of fin whales is about 2.3 times that of sperm whales.
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