Western Normal University Edition First Grade Mathematics Volume 1
Beijing Normal University Edition Seventh Grade Mathematics Volume 1
People's Education Press First Grade Mathematics Volume 1
People's Education Press Second Grade Mathematics Volume 1
People's Education Press Third Grade Mathematics Volume 1
Beijing Normal University Edition Seventh Grade Mathematics Volume 2
Hebei Education Edition Third Grade Mathematics Volume 1
Beijing Normal University Edition Eighth Grade Mathematics Volume 1
Qingdao Edition Seventh Grade Mathematics Volume 1
Beijing Normal University Edition Fifth Grade Mathematics Volume 1
Hebei Education Edition Seventh Grade Mathematics Volume 2
People's Education High School Mathematics Edition B Compulsory Course 2
Beijing Normal University Edition Fifth Grade Mathematics Volume 2
Hebei Education Edition Fourth Grade Mathematics Volume 2
People's Education Press First Grade Mathematics Volume 2
Qingdao Edition Seventh Grade Mathematics Volume 2
Category | Format | Size |
---|---|---|
Western Normal University Edition Fourth Grade Mathematics Volume 1 | pptx | 6 MB |
Description
"Law of Addition" The relationship between addition and subtraction and the law of addition PPT courseware 2
situational mathematics
1. How many saplings should be purchased in total?
Column formula: 56+72+28 How to calculate?
Method 1: First count the total number of holly and willow trees, and then count. . .
(56+72)+28=128+28=156 (tree)
Method 2: First count the total number of poplar trees in the Willow River and then do the calculation. . .
56+(72+28)=56+100=156 (tree)
2. How many flower seedlings should be purchased in total?
Column formula: 80+88+112 How to calculate?
Method 1: First count the total number of roses and peonies, and then count. . .
(80+88)+112=168+112=280 (tree)
Method 2: Count the total number of peonies and camellias first, and then do the calculation. . .
80+(88+112)=80+200=280 (tree)
What can you discover by doing calculations?
Is this a rule in addition operations? Let’s verify it!
1. (45+25)+13=45+(25+13)
2. (325+82)+18=325+(82+18)
Summary: To add three numbers, add the first two numbers first and then add the third number; or add the last two numbers first and then add the first number. Their sum remains unchanged. ——This law is called the associative law of addition.
Please use the associative law of addition to simply calculate the following questions.
1.282+63+37
2.45+17+83
3. 68+49+132+41
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For more information about "The relationship between addition and subtraction and the law of addition and the law of addition" PPT courseware, please click the "The relationship between addition and subtraction and the law of addition ppt" The law of addition ppt tag.
"Law of Addition" PPT courseware on the relationship between addition and subtraction and the law of addition:
"Law of Addition" The relationship between addition and subtraction and the law of addition PPT courseware The commutative law of addition: the addition of two numbers exchanges the positions of the two addends and the sum remains unchanged. a+b=b+a If the letters a, b, c represents three addends, then it can be written as: (a+b)+c=a+(b+c) The three numbers are similar...
"The Relationship between Addition and Subtraction" PPT courseware on the relationship between addition and subtraction and the law of addition:
"The Relationship between Addition and Subtraction" The relationship between addition and subtraction and the law of addition operation PPT courseware fill in the blanks: ( )+20=50 120+ ( )=150 ( )+40=100 150+ ( )=200 ( )+35=60 Learning objectives 1. Combined with specific problem situations, guide students to understand and master...
"Application of the Law of Addition for Simple Calculations" Law of Operation PPT Courseware 6:
"Using the Law of Addition for Simple Calculations" PPT Courseware 2 Let's talk about what arithmetic laws are applied to each of the following equations. 27+54=54+27 The commutative law of addition 34+(20+7) =(34+20)+7 The associative law of addition (48+36)+64=48+(36+64) The addition knot..
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Update Time: 2024-10-20
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