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Category | Format | Size |
---|---|---|
Hebei Education Edition Fifth Grade Mathematics Volume 1 | pptx | 6 MB |
Description
"Three-step mixed operations with square brackets" Four mixed operations PPT courseware
teaching objectives
1. Combined with specific examples, experience the process of independently solving problems and mixing the order of operations.
2. Master the order of operations of the four mixed arithmetic operations with square brackets, be able to perform calculations correctly, and be able to answer slightly complex practical problems.
3. In the process of communicating algorithms with others, be able to express the thinking process and results of solving problems in an organized manner, and build self-confidence in learning mathematics well.
The four cartons below are filled with 72 flower balls and 32 green balls of the same size. Now to pack 468 such balls in the same carton, how many cartons are needed?
Tell me what you discovered from the picture? What problem is to be solved?
(72+32)÷4=26 (pieces)
468÷26=18 (pieces)
Answer: 18 cartons are needed.
How to list the step-by-step calculations into a comprehensive calculation?
(72+32)÷4=26 (pieces)
468÷26=18 (pieces)
468÷[(72+32)÷4]
=468÷[ 104÷4 ]
=468÷26
=18(pieces)
Answer: 18 cartons are needed.
In conclusion
In a calculation, if there are parentheses and square brackets, the calculation inside the small brackets must be done first, and then the calculation inside the square brackets.
practice
1. First tell the order of operations of the following questions, and then calculate.
2.5×(3.2+1.8÷0.02)
=2.5×(3.2+90)
=2.5×93.2
=233
30×[ 7.5÷(2.7-1.2)]
=30×[ 7.5÷1.5 ]
=30×5
=150
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For more information about the PPT courseware "Four Mixed Operations Three-step Mixed Operations with Square Brackets" PPT courseware, please click the "Four Mixed Operations ppt Three-step Mixed Operations with Square Brackets ppt" tag.
File Info
Update Time: 2024-10-18
This template belongs to Mathematics courseware Hebei Education Edition Fifth Grade Mathematics Volume 1 industry PPT template
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