Western Normal University Edition First Grade Mathematics Volume 1
People's Education Press First Grade Mathematics Volume 1
Beijing Normal University Edition Seventh Grade Mathematics Volume 1
People's Education Press Third Grade Mathematics Volume 1
People's Education Press Second Grade Mathematics Volume 1
Beijing Normal University Edition Fifth Grade Mathematics Volume 1
Hebei Education Edition Third Grade Mathematics Volume 1
Hebei Education Edition Seventh Grade Mathematics Volume 2
Beijing Normal University Edition Seventh Grade Mathematics Volume 2
Qingdao Edition Seventh Grade Mathematics Volume 1
People's Education High School Mathematics Edition B Compulsory Course 2
Beijing Normal University Edition Eighth Grade Mathematics Volume 1
Jiangsu Education Edition Fourth Grade Mathematics Volume 1
Qingdao Edition Seventh Grade Mathematics Volume 2
Qingdao Edition Second Grade Mathematics Volume 2
People's Education Press First Grade Mathematics Volume 2
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Category | Format | Size |
---|---|---|
Qingdao Edition Fourth Grade Mathematics Volume 1 | pptx | 6 MB |
Description
"Protect the Swan" PPT courseware 8
Happy eating fruit.
35×2=70 140×7=980 280×3=840
230×4=920 13×6=78 140×6=840
18×3=54 250×3=750 17×5=85
Explore new knowledge
① Oral calculation: Student: First use 106×3=318 and then add a 0 at the end of the product.
②Written calculation:
106 106 106
×30 ×30 ×30
000 3180 3080
318 Simple and correct Error
3180
Correct but not easy
Summary method
Tell me about the written multiplication method with 0 in the middle and at the end of the factors?
How to determine the number of zeros at the end of the product? What should you pay attention to when writing vertical style?
First multiply the numbers before 0, and then look at how many 0s there are at the end of the two factors, then add how many zeros at the end of the product.
When writing the vertical form, align the numbers before the 0 at the end.
I will fill in
The product of 1.40×50 is ( ) digits, and there are ( ) 0s at the end of the product.
2. Multiply the smallest two-digit number and the smallest three-digit number, and the product is ( ).
Fill in ">""<" or "=" in ( ).
120×20 ( ) 12×200 500×10 ( ) 10×550
16×400 ( ) 210×4 0 19×300 ( ) 30×180
23×90 ( ) 23×900 20×15 ( ) 2×150
Do you have an easy way to compare the size of each equation?
"Choose" Supermarket
(1) The simplest way to write 400×520 is ( )
(2) The smallest product of a two-digit number and a three-digit number is ( )
A. 100000 B. 10000 C. 1000
(3) 5600 times 50, there are ( ) zeros at the end of the product.
A, 3 B, 4 C, 5
(4)508×40, their product is ( )
A. 2320 B. 20320 C. 2032
test you!
If there is a 0 at the end of the factor, first add the number before the 0 ( ).
Look at the total number of 0s at the end of ( ), and add a few 0s at the end of ( ).
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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 7:
"Protect the Swan" PPT Courseware 7 Teaching Objectives In this lesson, we will mainly learn the written calculation of three-digit times two-digit numbers. Students must master the method of vertical calculation and be able to calculate the vertical calculation of three-digit times two-digit numbers. calculation problems and can solve related application problems. you..
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Update Time: 2024-09-11
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