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Authoritative PPT Summary
"Operations of Numbers" Numbers and Algebra PPT Courseware 2
1. Introduce questions and review old knowledge
(1) Review review methods
Question: What operations have we learned?
Default: addition, subtraction, multiplication, division.
Transition: Each operation has its own meaning and its own calculation rules.
Next we will review and organize this part of the knowledge.
Present: (hint)
1. Recall the knowledge points of addition, subtraction, multiplication and division.
2. Be familiar with the concepts of these knowledge
3. Grasp the relationship between knowledge points
4. Organize knowledge
Requirement: Please try to organize this part of knowledge according to the prompts.
The calculation rules can be illustrated with examples.
2. Organize and review old knowledge
(2) Reporting and exchange
1. The meaning of operations
Default:
The meaning of addition: The operation of combining two (or several) numbers into one number is called addition.
The meaning of subtraction: knowing the sum of two addends and one of the addends, the operation of finding the other addend is called subtraction.
The meaning of multiplication: a simple operation to find the sum of several identical addends.
The meaning of division: knowing the product of two factors and one of the factors, find the operation of the other factor.
Monitor: The meaning of multiplication.
(1) The meaning of integer multiplication: a simple operation to find the sum of several identical addends.
(2) The meaning of decimal multiplication:
The meaning of decimal multiplication of integers is the same as that of integer multiplication, and it is also a simple operation to find the sum of several identical addends;
(3) The meaning of fraction multiplication:
The multiplication of an integer and a fraction can sometimes mean the addition of several identical fractions, and sometimes it can mean what fraction of the whole number is;
Multiplying two fractions means finding what fraction of one of the fractions is.
2. Rules of operation
Question: Please discuss in the group, what are the similarities in the operation rules of integers, decimals, and fractions? What's the difference? You can give examples.
Report and exchange:
Addition and Subtraction:
Default: ①
How to calculate integer addition:
If the same digits are aligned, starting from the ones digit, if the number on which digit adds up to ten, advance 1 to the previous digit.
How to calculate integer subtraction:
If the same digits are aligned, start subtracting from the ones digit. If the number in any digit is not enough to subtract, go back 1 from the previous digit, add ten to the base digit, and then subtract.
How to calculate decimal addition:
Align the decimal points and add them up from the last digit. If the number in any digit adds up to ten, advance 1 to the previous digit. Finally, align the decimal point on the horizontal line in the resulting number and click on the decimal point.
3. Consolidate practice
Observe each calculation question carefully and first think about what operation it is. Think again about the calculation method.
Finally, think about what you need to pay attention to.
73.05-3.96 27.5×1.4 3.12÷15+4.71 12.5×28-193
4. Assign homework
Homework: Exercise 15 on page 79, question 1.
Exercise 15 on page 79, question 2.
Keywords: Number operations teaching courseware, People's Education Press sixth grade mathematics courseware volume 2, Sixth grade mathematics slide courseware download, Number operations PPT courseware download, .ppt format
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