"Sequence of Mixed Operations with Parentheses" Four Arithmetic Operations PPT Courseware

Description

"Sequence of Mixed Operations with Parentheses" Four Arithmetic Operations PPT Courseware

1. Review old knowledge and introduce new lessons

Discuss the order of operations for the following questions.

2. Experience the process and feel the effects

Can you ask any math questions?

There are 12 boys and 4 girls in the school's aircraft model team. The art team is twice as large as the aircraft model team. How many people are there in the art team?

3. In-depth research and perfect findings

There are 12 boys and 4 girls in the school's aircraft model team. The art team is twice as large as the aircraft model team. There are 64 people in the chorus group. How many times the number of people in the chorus group is that of the art group?

The number of people in the chorus group ÷ the number of people in the art group = how many times

do you know?

Parentheses "( )" were first used by the Dutchman Goulart in the 17th century AD.

The square brackets "[ ]" were first used by the British mathematician Wallis in the 17th century AD.

Braces "{ }", also known as curly braces, will also be used in future studies. Braces were first used by French mathematician Veda in 1593.

4. Consolidate practice and continue to deepen

1. Basic exercises.

First talk about the order of operations of the following questions, and then calculate.

(1)360÷(70-4×16)

(2)158-[(27+54)÷9]

2. Comprehensive exercises.

See who can do the following questions correctly.

72-4×6÷3 6000÷75-60-10

(72-4)×6÷3 6000÷(75-60)-10

(72-4) × (6÷3) 6000÷[75-(60-10)]

5. Expand knowledge, evaluate and summarize

① An education expert asked primary school students to participate in a small game. There is a bottle with a big belly and a small mouth on the table. There are three small balls tied with strings.

②The expert said: "I give an order to see which group of students can pull three balls out of the bottle within three seconds."

③ The students took turns to participate. As a result, either all three balls were stuck in the mouth of the bottle, or the time exceeded and they all failed.

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Update Time: 2024-11-22

This template belongs to Mathematics courseware People's Education Press fourth grade mathematics volume 2 industry PPT template

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