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Authoritative PPT Summary
"The Law of Change of Product" Multiplying three-digit numbers with two-digit numbers PPT courseware 3
Who can summarize the two discovered laws into one sentence?
When two numbers are multiplied together, when one factor remains unchanged and the other factor is multiplied by something, the product must also be multiplied by something.
When two numbers are multiplied together, when one factor remains unchanged and the other factor is divided by a certain number, the product must also be divided by a certain number.
When two numbers are multiplied, one factor remains unchanged and the other factor is multiplied (or divided) by a certain number. (Except 0) the product must also be multiplied (or divided) by a certain number.
Autonomous verification
Just now we found the change characteristics of products. Do all multiplication calculations have this characteristic? What should we do to solve this problem?
(We can find some examples of multiplication formulas and study them using the comparison method just now to see if the change in product has this characteristic.)
Consolidation exercises
1. I can fill it out accurately.
⑴If one factor is multiplied by 10 and the other factor remains unchanged, the product should be ( ).
⑵ If two factors are divided by 10 at the same time, the product should be ( ).
⑶ Multiply one factor by 10, divide the other factor by 10, and the product is ( ).
2. Judgment.
⑴ One factor becomes smaller and the other factor becomes larger, but the product remains unchanged. ( )
⑵ If one factor is multiplied by 8, to keep the product unchanged, the other factor must also be multiplied by 8. ( )
⑶ If a number is multiplied by 5 and then divided by 5, the result is still the same number. ( )
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For more information about the PPT courseware "The Changes of the Product of Three Digits Multiplied by Two Digits", please click the Change Rules of the Product of Three Digits Multiplied by Two Digits ppt ppt tag.
"The Law of Change of Product" Multiplication of two-digit numbers by two-digit numbers PPT courseware:
"The law of change of product" Multiplication of two digits by two digits PPT courseware teaching objectives In this lesson we will study the law of change of product. Students should actively use their brains to explore the law of change of product and see who summarizes the law. Most accurate. Observe this set of calculations and say something...
"The Law of Change of Product" Three-digit times two-digit PPT courseware 2:
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"The law of change of product" three-digit times two-digit PPT courseware:
"Change Rules of Product" Multiplying Three-digit Numbers by Two-digit PPT Courseware When multiplying two numbers, one factor remains unchanged, the other factor is multiplied by a certain number (except 0), and the product is also multiplied by a certain number. When two numbers are multiplied, one factor remains unchanged, the other factor is divided by a number (except 0), and the product is also divided by a number. Two numbers match each other...