"Extension of the law of addition of integers to decimals" Addition and subtraction of decimals PPT Simple campus recruitment activity planning plan summary enterprise and institution recruitment publicity lecture PPT template is a general PPT template for business post competition provided by the manuscript PPT, simple campus recruitment activity planning plan summary enterprise and institution recruitment promotion Lecture PPT template, you can edit and modify the text and pictures in the source file by downloading the source file. If you want more exquisite business PPT templates, you can come to grid resource. Doug resource PPT, massive PPT template slide material download, we only make high-quality PPT templates!
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Authoritative PPT Summary
"Extension of the law of addition of integers to decimals" Addition and subtraction of decimals PPT
Part One: Review Import
Calculate it as easily as possible.
72＋42＋28＋158
357-85-15
The commutative law of addition, the associative law of addition and the properties of subtraction are used.
What laws of operation were applied in the calculation?
Commutative law of addition: a+b=b+a
Additive associative law: a+b+c=a+(b+c)
Properties of subtraction: a-b-c=a-(b+c)
The law of addition of integers is extended to decimals PPT, part two: exploring new knowledge
Are the results on both sides of each set of equations below equal?
3.2＋0.5 0.5＋3.2
(4.7+2.6)+7.4 4.7+ (2.6+7.4)
The commutative and associative laws of addition of integers also apply to the addition of decimals.
Applying the laws of operations can make some decimal calculations easier.
Calculate 0.6+7.91+3.4+0.09.
How are you going to calculate it?
I count from left to right.
0.6＋7.91＋3.4＋0.09
Calculate 0.6+7.91+3.4+0.09.
This is how I calculated it.
How are you going to calculate it?
The law of addition of integers is extended to decimals PPT, the third part: consolidation exercises
1. Fill in the appropriate number in □.
(1) 6.7＋4.95＋3.3 = 6.7＋□+4.95
This calculation applies the commutative law of addition.
(2) (1.38 + 1.75) + 0.25
＝＋（＋）
This calculation applies the additive associative law.
2. Calculate the following questions as easily as possible.
1.88＋2.3＋3.7
4.02-3.5+0.98
The law of addition of integers is extended to decimals PPT, Part 4 content: Class summary
In the mixed operations of the four decimal arithmetic, we must carefully observe the characteristics of each number, pay attention to the relationship between numbers and the operation symbols in front of each number, and appropriately use the commutative law of addition, associative law and the operational properties of subtraction to perform simple operations. First add and subtract two or more numbers that can be "rounded".
The law of addition of integers is extended to decimals PPT, part 5: homework
1. Log in to query and download "Classwork Design".
2. Related exercises in the exercise book.
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