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Authoritative PPT Summary
"Today I am in charge" PPT courseware 4
1. Situation introduction
Soybeans 4.82 yuan per kilogram Rice 4.72 yuan per kilogram
The unit price of mung beans is 1.5 times that of soybeans, and millet is 5.28 yuan per kilogram.
How much does it cost to buy 2.5 kilograms of mung beans? If we buy 2.5 kilograms of rice and millet each, how much will it cost in total?
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 it cost to buy 2.5 kilograms of mung beans?
Think about the following two questions first, and then answer them.
1. To solve this problem, what can you ask for first and what can you ask for next?
2. Think about it in real life, how should you pay? Usually in situations like this, how many decimal places should the calculation result be kept?
give it a try
1. Rice is 4.72 yuan per kilogram, and millet is 5.28 yuan per kilogram. How much does it cost to buy 1 kilogram of rice and 2 kilograms of millet?
The price of 1 kilogram of rice + the price of 2 kilograms of millet
4.72+5.28×2
＝4.72＋10.56
=15.28 (yuan)
Answer: A total of 15.28 yuan is required.
2. Tomatoes cost 5.46 yuan per kilogram, and cucumbers cost 2.24 yuan per kilogram. How much more does it cost to buy 1 kilogram of tomatoes than 2 kilograms of cucumbers?
4.72-2.24×2
=4.72-4.48
=0.24 (yuan)
Answer: It costs 0.24 yuan more to buy 1 kilogram of tomatoes than to buy 2 kilograms of cucumbers.
Think about it, in a mixed decimal arithmetic calculation, there are both multiplication and addition (or subtraction). What should be calculated first? What else?
3. Independent practice
1. First state the order of operations for each question, and then calculate.
5.5×1.52-2.03 2.8×5.5×1.3
0.71＋0.25×0.4 1.25×1.5×0.8
2. Find approximate values.
1.2×2.4≈ 2.9 (retain one decimal place)
5.02×1.7≈ 8.5 (retain one decimal place)
0.11×0.53≈0.06 (result is accurate to percentile)
0.76×1.45≈1.10 (result is accurate to percentile)
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"Today I am in charge" PPT courseware 5:
"Today I am in charge" PPT courseware 5 1. Situation introduction Rice is 4.72 yuan per kilogram. Millet is 5.28 yuan per kilogram. How much does it cost to buy 2.5 kilograms of rice and millet each? What mathematical information do you know from the picture? Based on this information, what questions can you ask...
"Today I'm in charge" PPT courseware 3:
"Today I am in charge" PPT courseware 3 1. Situation introduction Meat is 25.6 yuan per kilogram, and I bought 0.9 kilograms. How much did it cost to buy the meat? The price of fish is 14.8 yuan per kilogram, and I bought 1.5 kilograms. How much did it cost to buy the fish? What mathematical information do you know from the picture? According to these...
"Today I am in charge" PPT courseware 2:
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