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People's Education High School Mathematics Edition B Compulsory Course 2
Hebei Education Edition Fourth Grade Mathematics Volume 2
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Qingdao Edition Seventh Grade Mathematics Volume 2
Category | Format | Size |
---|---|---|
Hebei Education Edition Fourth Grade Mathematics Volume 2 | pptx | 6 MB |
Description
"Using letters to represent the commutative law of addition" PPT
Part One: Operational Rules
(1) If not calculated, fill in the appropriate symbols in the circle.
78+301 301+78
219+86 86+219
(2) Use □ and △ to represent any two numbers. What symbols should be filled in the circles?
Swapping the positions of two numbers leaves the sum unchanged.
This is called the commutative law of addition.
(3) If a represents an addend and b represents another addend, the commutative law of addition can be expressed as an alphabetical formula: a+b=b+a
If a, b, and c represent three addends respectively, the additive associative law can be expressed as an alphabetical formula:
(a+b)+c=a+(b+c)
Simple calculations can be made by applying the law of addition.
Can you give an example of applying the law of addition?
27+34+66 is easy to calculate:
Use letters to represent the commutative law of addition PPT, part 2: practice
1. Calculate using simple methods.
336+245+264=
189+425+275=
2. There are 80 students in the school choir. Among them, there are x boys and ( ) girls.
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Update Time: 2024-10-15
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