"Protect the Swan" PPT courseware

Description

"Protect the Swan" PPT courseware

1. Overall review

What have you learned about multiplying three-digit numbers by two-digit numbers?

Three digits multiplied by two digits

Number operations

Oral calculation

written calculation

The changing pattern of product

Solve the problem

Solve problems with pen math

Solve problems with estimates

Choose the appropriate calculation method to solve the problem

How do you want to organize them respectively?

2. System sorting

Oral arithmetic for multiplying three-digit numbers by two-digit numbers.

400×30

500×20

120×40

First, multiply the numbers before 0, then count the total number of 0s after the factors, and add a few 0s after the product.

3. Comprehensive application

1. Oral calculation.

300×40= 50×20= 30×60=

40×900= 20×400= 200×80=

Think about it, how do you calculate a three-digit number multiplied by a two-digit number?

2. A sharp eye distinguishes right from wrong.

Teacher Zhang brought 2,000 yuan to purchase 12 identical calculators for the school.

How many different purchasing options are there? How much do they cost?

Think about it: Does solving this problem require accurate calculations?

Just estimate.

205≈200

12≈10

200×10=2000 (yuan)

Think about it: Does solving this problem require accurate calculations?

Accurate calculation is required.

85×12=1020 (yuan)

140×12=1680 (yuan)

205×12=2460 (yuan)

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For more information about the "Protect the Swans" PPT courseware, please click the "Protect the Swans" ppt tab.

"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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