"Three-step mixed operations containing two-level operations in parentheses" Four Mixed Operations PPT Courseware

Description

"Three-step mixed operations containing two-level operations in parentheses" Four Mixed Operations PPT Courseware

teaching objectives

1. Combined with specific examples, experience the process of independently solving problems, communicating different solutions, and learning the four mixed operation sequences containing two-level operations in parentheses.

2. Master the order of four mixed operations containing two-level operations in parentheses, be able to perform calculations correctly, and be able to answer simple practical problems of three-step calculations.

3. Experience the process of communicating algorithms with others and be able to express your own ideas and thinking process for solving problems.

A garment factory received an order to process 660 suits and agreed to complete it within 8 days.

First find the number of sets processed in the first three days.

75 × 3 = 225 (sets)

Then find the remaining number of sets.

660 - 225 = 435 (set)

Finally, find the minimum number of sets left to be processed every day.

435 ÷ 5 = 87 (sets)

A: The rest have to process at least 87 sets every day.

give it a try

First tell the order of operations for the following questions, and then calculate.

40.2÷(0.6×11+5.4) (48-64.6÷3.4)×0.6

= 40.2÷(6.6+5.4) =(48-19)×0.6

= 40.2÷12 = 29×0.6

= 3.35 = 17.4

3.2×(2.25+2.5×8) (2.8+3.2×4)÷1.5

= 3.2×(2.25+20) = (2.8+12.8)÷1.5

= 3.2×22.25 = 15.6÷1.5

= 71.2 = 10.4

There are both multiplication and division as well as addition and subtraction in parentheses. Multiplication and division must be calculated first, and then addition and subtraction.

practice

1. Three teachers led 45 students to visit the underwater world, and the tickets cost a total of 1,995 yuan. Adult tickets are 65 yuan each. How much are student tickets?

(1995-3×65)÷45

=(1995-195)÷45

=1800÷45

=40 (days)

Answer: Student tickets are 40 yuan each.

2. It’s about 1,000 meters from Xiaoming’s house to Science City. Xiao Ming has already walked for 12 minutes. How many more minutes will he need to walk to the Science City?

(1000－12×53)÷53

=(1000-636)÷53

=364÷53

≈7 (minutes)

Answer: It takes about 7 minutes to walk to Science City.

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File Info

Update Time: 2024-11-15

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

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