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"Today I am in charge" PPT courseware 3
1. Situation introduction
The price of 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?
What questions can you ask based on this information?
2. Cooperation and exploration
How much did it cost to buy the meat?
25.6×0.9 =
Thinking: Both factors are decimals, how to calculate them?
3. Independent practice
1. Can you add the decimal point to the sum of the following questions?
8.1 0.6 4 2 1.4 3
× 0.4 × 2.5 ×0.2 4
3 2 4 3 2 0 8 5 7 2
1 2 8 4 2 8 6
1 6 0 0 5 1 4 3 2
2. Use vertical calculation.
0.8×18.5＝14.8
1 8.5
× 0.8
1 4.8 0
3. An ordinary tomato weighs about 0.36 kilograms, and the tomatoes produced by the "space seeds" weigh about 2.8 times as much. How many kilograms does a tomato grown from a "space seed" weigh?
0.36×2.8 = 1.008(kg)
Answer: The tomatoes grown from space seeds are about 1.008 kilograms.
4. A box of Ganmaoling granules contains 9 bags, each bag contains 0.2 grams of "acetaminophen".
(1) How many grams of acetaminophen does a box of Ganmao Ling contain?
0.2×9 = 1.8(grams)
Answer: A box of Ganmao Ling contains 1.8 grams of acetaminophen.
(2) How many grams of acetaminophen can a child consume by drinking half a bag each time?
0.2×0.5 = 0.1 (gram)
Answer: You can take 0.1 grams of "acetaminophen".
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"Today I am in charge" PPT courseware 2:
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