"Protecting Swans" PPT Courseware 4

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"Protecting Swans" PPT Courseware 4

1. Situation introduction

Quickly calculate the following questions orally

8×2= 24×2=

8×20= 12×2=

8×200= 6×2=

2. Cooperation and exploration

Observe each set of calculations. What can you find?

8×2= 24×2=

8×20= 12×2=

8×200= 6×2=

In the multiplication formula, if one factor remains unchanged and the other factor is multiplied by the number, the resulting product will be equal to the original product multiplied by the number;

If one factor remains unchanged and the other factor is divided by the number, the resulting product will be equal to the original product divided by the number.

3. Independent practice

1. Do the math and compare.

5×14= 24×2= 8×7=

50×14= 24×4= 80×70 =

500×14= 24×8= 800×700=

Discuss in the group how you calculated it.

2. Fill it out.

× 16 = 400

× 32 = 800

× 80 = 2000

3. According to 67×35=2345, directly write the products of the following formulas.

67×35=2345

670×35＝23450

6700×35＝234500

670×350=234500

67×350=23450

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"Protecting Swans" PPT courseware 10:

"Protect the Swan" PPT Courseware 10 Oral Calculation 62 = 204 = 620 = 104 = 6200 = 54 = 1.6 What is the expansion to 10 times of the original size? 610=60 What would it be if 2.6 were expanded to 100 times its original size? 6100=600 Summary: Multiplying a number can also be said to multiply this number...

"Protecting Swans" PPT Courseware 9:

"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. Let’s practice. What is the 10 times expansion of 1.6? 610=60 2.35 reduced by 5 times..

"Protecting Swans" PPT courseware 8:

"Protecting Swans" PPT courseware 8 Happy eating fruit. 352=70 1407=980 2803=840 2304=920 136=78 1406=840 183=54 2503=750 175=85 Explore new knowledge ① Oral calculation: Student: First use 1063=318 and then add a 0 at the end of the product. ②Written calculation...

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Update Time: 2024-11-22

This template belongs to Mathematics courseware Qingdao Edition Fourth Grade Mathematics Volume 1 industry PPT template

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