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Authoritative PPT Summary
"Concern about the Environment" PPT courseware
teaching objectives
1. When calculating the addition and subtraction of fractions with different denominators, you must first add and subtract fractions with the same denominator.
2. Be proficient in the rules of addition and subtraction of fractions with different denominators.
What percentage of the total area of rapeseed and mushrooms accounts for the area of this company's main crops?
Which area is more planted with wheat or mushrooms? How much more?
think about it
What are your experiences through exploring the calculation methods of adding and subtracting different denominators?
When calculating addition and subtraction of fractions with different denominators:
You must first add and subtract fractions with the same denominator to calculate.
(1) Fractions have different units and cannot be added or subtracted directly.
(2) Convert fractions with different denominators into fractions with the same denominator.
Summary of this lesson
1. When calculating the addition and subtraction of fractions with different denominators, you must first add and subtract fractions with the same denominator.
2. Fractions have different units and cannot be added or subtracted directly.
3. Convert fractions with different denominators into fractions with the same denominator.
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"Concern about the Environment" PPT Courseware 3:
"Concern for the Environment" PPT Courseware 3 Teaching Objectives 1. When calculating the addition and subtraction of fractions with different denominators, the fractions must be connected first, and then the calculations must be made according to the addition and subtraction of fractions with the same denominator. 2. Be proficient in the rules of addition and subtraction of fractions with different denominators. Rapeseed and mushrooms account for the total area of this company's main crops...
"Concern about the Environment" PPT Courseware 2:
"Concern for the Environment" PPT courseware 2 1. Situation introduction What fraction of the days in the whole month are the number of days with excellent quality and the number of days with good quality? By what fraction of the total number of days in a month are there more days with good quality than days with slight pollution? From the picture, what mathematical information do you know...