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Authoritative PPT Summary
"Protecting Swans" PPT courseware 9
What patterns did you discover through the observations just now?
If one factor remains unchanged and the other factor is expanded to the original multiple, the product will also be expanded to the original multiple.
practice
1.6 What is the expansion of 10 times? 6×10=60
How much is 2.35 reduced by 5 times? 35÷5=7
3.6 What is the expansion of 100 times? 6×100=600
4.What is 100 reduced by 4 times? 100÷4=25
If one factor remains unchanged and the other factor shrinks to its original size, the product will also shrink to its original size.
Do it:
Find the product of the first question in each set of questions, and then quickly write the product of the following two questions.
12×3＝ 48×5＝ 24×5＝
120×3＝ 48×50＝ 24×25＝
1200×3＝ 48×500＝ 24×75＝
Do it:
Calculate the product of each of the following questions and explain how you calculated it.
5×14＝ 24×2＝ 8×7＝
50×14＝ 24×4＝ 8×70＝
500×14＝ 24×8＝ 8×700＝
Expand the length of this rectangular park to three times its original size without changing the width.
What will be the size of the park after the expansion?
Answer: The area of the park after expansion is 36 hectares.
Summary
After studying this lesson, students must master the law of change of product and be able to apply this law to solve practical problems.
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"Protecting Swans" PPT courseware 10:
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