"Today I am in charge" PPT courseware 5

Description

"Today I am in charge" PPT courseware 5

1. Situation introduction

Rice 4.72 yuan per kilogram

Xiaomi costs 5.28 yuan per kilogram

Buy 2.5kg each of rice and millet

How much does it cost in total?

What mathematical information do you know from the picture?

What questions can you ask based on this information?

2. Cooperation and exploration

How much does it cost in total?

Rice 4.72 yuan per kilogram

Xiaomi costs 5.28 yuan per kilogram

Buy 2.5kg each

Can you use comprehensive calculations to solve the problem?

give it a try

Use a simple method to calculate the following questions and explain what arithmetic laws are used?

①12.25＋36＋7.75　 ②1.25×1.68×8

=12.25+7.75+36 =(1.25×8)×1.68

＝20＋36 ＝10×1.68

=56 =16.8

Commutative law of addition, associative law Commutative law of multiplication, associative law

③19.7×5.3＋4.7×19.7 ④10.1×87

=19.7×(5.3+4.7) =(10+0.1)×87

＝19.7×10 ＝10×87＋0.1×87

=197 =870+8.7

Distributive law of multiplication = 878.7

distributive law of multiplication

3. Independent practice

1. Fill in the blanks.

(1)1.25×7.7×8= × ×7.7

(2)6.1×5.4+3.9×5.4=(+)×5.4

(3)2.5×(10+4)= × + ×

(4)13×10.1=13×( + )= × + ×

2. Use simple methods to calculate the following questions.

①0.25×368×40 ②1.7×101

③7.8×9＋7.8 ④19.7×5.3+4.7×19.7

3. A certain school held a theatrical performance to celebrate "Teacher's Day" and made 36 sets of chorus costumes and 14 sets of dance costumes. If an average of 1.8 meters of fabric is used per set, how many meters of fabric are needed in total?

1.8×36＋1.8×14

= 1.8×(36+14)

= 1.8×50

= 90(meter)

Answer: A total of 90 meters of fabric are needed.

Keywords: Today I am in Charge teaching courseware, Qingdao edition fifth grade mathematics volume 1 PPT courseware download, fifth grade mathematics slide courseware download, Today I am in charge PPT courseware download, .PPT format;

For more information about the PPT courseware "Today I am in charge", please click on the "Today I am in charge" ppt tag.

"Today I am in charge" PPT courseware 4:

"Today I am in charge" PPT courseware 4 1. Situation introduction Soybeans are 4.82 yuan per kilogram. Rice is 4.72 yuan per kilogram. The unit price of mung beans is 1.5 times that of soybeans. Millet is 5.28 yuan per kilogram. How much does it cost to buy 2.5 kilograms of mung beans? If you buy 2.5 kilograms of rice and millet each, the total...

"Today I'm in charge" PPT courseware 3:

"Today I am in charge" PPT courseware 3 1. Situation introduction Meat is 25.6 yuan per kilogram, and I bought 0.9 kilograms. How much did it cost to buy the meat? The price of fish is 14.8 yuan per kilogram, and I bought 1.5 kilograms. How much did it cost to buy the fish? What mathematical information do you know from the picture? According to these...

"Today I am in charge" PPT courseware 2:

"Today I'm in charge" PPT courseware 2 1. Situation introduction Can you calculate these two questions? 0.5575= 0.5564= What mathematical information do you know from the picture? 2. Collaborative exploration 0.5575=41.25 0.5564=35.2 Think about it: How to calculate decimals multiplied by integers..

File Info

Update Time: 2024-11-18

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

Preview