"Four Mixed Operations with Decimals" PPT Courseware 3

Description

"Four Mixed Operations with Decimals" PPT Courseware 3

learning target

1. Knowledge goal: Combined with specific situations, understand the connection and difference between the four mixed operations of decimals and the four mixed operations of integers.

2. Ability goal: Master the order of mixed decimal operations and be able to correctly perform mixed decimal operations.

3. Emotional goals: Understand the application value of four mixed decimal operations in real life, gain valuable experience from it, and strengthen students' confidence in learning mathematics well.

1. Calculate the following questions.

① 368+32×5-315

② 30÷[480÷(24-8)]

③ 47－35＋42

2. Talk about what should be counted first, what should be counted next, and what should be counted last in the above three questions?

① If the question does not have parentheses, you should calculate multiplication first, then addition, and finally subtraction;

② If the question has parentheses, you should calculate the subtraction inside the parentheses first, then the division inside the square brackets, and finally the division outside the parentheses;

③ Questions only contain operations of the same level and should be calculated from left to right.

Please compare these four comprehensive calculations and see what you find.

(1) 200-(35×3+63) (2) 200-35×3-63

=200-(105+63) =200-105-63

=200-168 =95-63

=32 (yuan) =32 (yuan)

(3) 20-(3.5×3+6.3) (4) 20-3.5×3-6.3

=20-(10.5+6.3) =20-10.5-6.3

=20-16.8 =9.5-6.3

=3.2 (yuan) =3.2 (yuan)

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For more information about the "Mixed Operations with Four Decimals" PPT courseware, please click the "Mixed Operations with Four Decimals" ppt tag.

"Four Mixed Operations with Decimals" PPT courseware 2:

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"Four Mixed Operations with Decimals" PPT courseware:

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Update Time: 2024-07-06

This template belongs to Mathematics courseware Western Normal University Edition Fifth Grade Mathematics Volume 1 industry PPT template

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