"Protecting Swans" PPT Courseware 6

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"Protecting Swans" PPT Courseware 6

Oral arithmetic:

23×30 = 47×20 =

42×19 ≈ 58×41 ≈

Do the math:

56 ×26 = 64 ×34 =

From the calculation just now, do you still remember the multiplication rule for two-digit numbers?

150×10=1500

150×2＝300

A little less than 1800 kilometers

It is more accurate to calculate in writing and get 1740

I checked it with a calculator and you calculated it correctly.

Discussion summary:

1. First multiply the number in the ones digit of the two-digit number by another factor, so that the last digit of the number is aligned with the ones digit of the two-digit number.

2. Then multiply the number in the tens digit of the two-digit number by another factor, so that the last digit of the number is aligned with the tens digit of the two-digit number.

3. Then add the products of the two multiplications.

Column vertical calculation

142×36 516×24 359×21

743×17 467×16 165×58

Think about it:

In order to enrich the students' extracurricular life, the school plans to purchase 14 footballs and 14 basketballs. Based on the information provided, what math questions can you ask?

I will apply

1 Guangming Cinema used to show three movies a day, but now it shows two more movies a day, with an average of 160 tickets sold per show. How many tickets can be sold per day now?

2 The school bought 64 dictionaries at a cost of 85 yuan each, and a computer for 3690 yuan. Please do the math. How much yuan did it cost in total?

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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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