"Happy Farm" PPT courseware 2

Description

"Happy Farm" PPT courseware 2

1. Situation introduction

Top 85 yuan.

Pants are 45 yuan.

Vest 32 yuan,

Buy 102 vests.

How much does it cost to buy a vest in total?

What mathematical information do you know from the picture?

2. Cooperation and exploration

How much does it cost to buy a vest in total?

32 × 102 =3264 (yuan)

Oral calculation: 100 pieces is 3,200 yuan.

2 pieces are 64 yuan,

The total is 3264 yuan.

3. Independent practice

1. Do the math and compare.

(1)21×17＋21×13 (17＋13)×21

= 357+273 = 30×21

= 630 = 630

(2)24×8＋16×8 (24＋16) ×8

= 192＋128 = 40×8

= 320 = 320

2. Calculate as easily as possible.

56×67+ 56×33 32×(200+3)

85×199+85 39×101

3. Fill it in, think about it, and do the math.

12×(8-5) ○12×8-12×5

(40-4)×25○40×25－4×25

15×7-5×7○(15-5)×7

18×9-8×9○(18-8)×9

What did you discover from the above equation?

Discover patterns:

The difference between two numbers is multiplied by a number. You can use this number to multiply the two numbers that are subtracted, and then subtract the products.

Can you express this pattern using letters?

(�-b)×c =�×c-b×c

�×c-b×c=(�-b)×c

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For more information about the "Happy Farm" PPT courseware, please click on the "Happy Farm ppt" tab.

"Happy Farm" PPT courseware 7:

"Happy Farm" PPT courseware 7

1. Situation introduction

There are 56 hollies, 72 willows, and 28 poplars.

How many saplings were purchased in total?

There are 80 roses, 88 peonies, and 112 camellias.

How many flower seedlings did you purchase in total?

Based on this information, you can...

"Happy Farm" PPT courseware 6:

"Happy Farm" PPT courseware 6

1. Situation introduction

Purchased 20 bags of flower soil, 25 bags per bag, 2 kilograms per bag.

How many kilograms of flower soil were purchased in total?

Purchased 10 bags of flower fertilizer, 8 bags per bag, 5 kilograms per bag.

How many kilograms of flower fertilizer were purchased in total? ..

"Happy Farm" PPT courseware 5:

"Happy Farm" PPT courseware 5

Class goals:

1. In the process of solving problems, discover and understand the distributive law of multiplication through mathematical activities such as observation, conjecture, verification, induction, and reasoning. (emphasis)

2. Be able to flexibly use the distributive law of multiplication to simplify...

File Info

Update Time: 2024-10-04

This template belongs to Mathematics courseware Qingdao Edition Fourth Grade Mathematics Volume 2 industry PPT template

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