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"Commonly Used Percents" Percentage PPT Courseware
teaching objectives
1. Combined with specific examples, go through the process of finding percentages commonly used in life.
2. Understand the specific meanings of various percentages such as germination rate, oil yield, and pass rate, and be able to solve simple practical problems of calculating percentages.
3. Understand the widespread application of percentages in real life and build confidence in learning mathematics well.
The Academy of Agricultural Sciences has cultivated 3 types of corn seeds with excellent varieties and conducted germination rate experiments. The results are as follows:
Try to find the germination rate of each type of seed yourself.
Precocious No. 1: 413÷500＝0.826＝82.6%
Fengsheng No. 5: 367÷420≈0.874≈87.4%
North No. 8: 331÷378≈0.876≈87.6%
practice
1. (1) Which one has the highest oil yield? How much higher?
(2) *No. 1 and No. 2 peanuts each weigh 500 kilograms. Based on the oil yield of the two peanuts, how many kilograms of peanut oil can be produced by frying?
2. The quality inspection department conducts spot checks on the quality of beverages. The results are as follows. Find the pass rate.
3. Lufa Seed Company used 380 seeds for germination tests. Find the germination rate.
4. A flour mill uses 8,000 kilograms of wheat to grind out 6,800 kilograms of flour. Find the flour extraction rate of wheat.
5. A flour mill uses 8,000 kilograms of wheat to grind out 6,800 kilograms of flour. Find the flour extraction rate of wheat.
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