"Two-Level Mixed Operations with Parentheses" Four Mixed Operations PPT Courseware

Description

"Two-Level Mixed Operations with Parentheses" Four Mixed Operations PPT Courseware

teaching objectives

1. Experience the process of independently solving problems and trying to rewrite step-by-step calculations into comprehensive calculations.

2. Combined with specific examples, understand the order of operations of the four mixed arithmetic operations with parentheses, and be able to perform simple integer mixed arithmetic operations with parentheses.

3. Actively participate in mathematics activities and gain preliminary experience in rewriting step-by-step calculations into comprehensive calculations.

My mother brought 50 yuan to buy fruit and 22 yuan to buy bananas. How many kilograms of oranges can you buy with the remaining money?

Tell me how to calculate it?

Observe the situation diagram and tell me what mathematical information you discovered?

① Step-by-step calculation: First calculate how many yuan you have left after buying bananas, and then calculate how many kilograms of oranges you can buy.

50-22＝28 (yuan)

28÷4＝7(kilogram)

Answer: You can buy 7 kilograms of oranges.

②Column comprehensive calculation formula

(50-22)÷4

=28÷4

=7 (kg)

Answer: You can buy 7 kilograms of oranges.

Writing like this, can we first calculate "50 -22"?

Adding parentheses changes the order of operations.

In conclusion

1. When rewriting a step-by-step calculation into one calculation, if the calculation contains both multiplication, division, addition, and subtraction, and the addition and subtraction need to be calculated first, you only need to add parentheses to the addition or subtraction calculation. , you can change the original order of operations.

2. In a calculation, if there are parentheses, the calculation inside the parentheses must be done first.

practice

1. Let’s talk about the order of operations first, and then calculate.

178－25×4 45＋234÷9

(178-25)×4 (45+234)÷9

2. Write each set of equations below into an equation and calculate.

(1)(135-72)÷7

=63÷7

=9

3×(164-96)

=3×68

=204

3. Wang Xia bought a 140-page story book and has read 86 pages. I plan to read the rest in 6 days. How many pages should I read every day?

(140-86)÷6＝9 (pages)

Answer: I read 9 pages every day.

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For more information about the PPT courseware "Four Mixed Operations Two-Level Mixed Operations with Brackets", please click on the "Four Mixed Operations ppt Two-Level Mixed Operations with Brackets ppt" tag.

"Two-Level Mixed Operations Without Parentheses" Four Mixed Operations PPT Courseware:

"Two-Level Mixed Operations Without Parentheses" Four Mixed Operations PPT Courseware Teaching Objectives 1. Experience the process of independent problem solving and try to rewrite step-by-step calculations into comprehensive calculations. 2. Combined with specific examples, understand the operation sequence of two-level mixed operations, and be able to carry out simple...

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Update Time: 2024-09-08

This template belongs to Mathematics courseware Hebei Education Edition Third Grade Mathematics Volume 1 industry PPT template

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