"Addition and Subtraction of Fractions" Fractions and Fractional Equations PPT (Course 2)

Description

"Addition and Subtraction of Fractions" Fractions and Fractional Equations PPT (Courseware No. 2), 28 pages in total.

learning target

Able to find the simplest common denominator of several fractions and perform common denominators of fractions.

Master the rules of addition and subtraction of fractions with different denominators, and be proficient in addition and subtraction operations with different denominators.

activity exploration

Explore point one

Question 1: Observation and thinking:

Convert fractions with different denominators into fractions with the same denominator, and then add and subtract the fractions with the same denominator.

Question 2: Xiao Ming and Xiao Liang both think that they only need to convert fractions with different denominators into fractions with the same denominator, and then add and subtract the fractions with the same denominator. But their methods are different. What do you think of the two methods?

Question 3:

(1) According to the __________ of a fraction, fractions with different denominators are converted into fractions with the same denominator. This process is called ______. When fractions with different denominators are ______, the simplest common denominator (the simplest common denominator) as their common denominator.

(2) By analogy with the addition and subtraction of fractions with different denominators, the rules for addition and subtraction of fractions with different denominators are: to add and subtract fractions with different denominators, first ______, then change them to fractions with the same denominator, and then ______.

In-class testing

There are two ships, large and small. The small ship transports x (x>40) tons of cargo every day. The large ship transports 10 tons more cargo every day than the small ship. Now let the big ship complete the task of transporting 100 tons of cargo, and the small boat complete the task of transporting 80 tons of cargo.

(1) Write down the time it takes for the big ship and the small ship to complete the task respectively;

(2) Try to explain which ship takes less time to complete the task?

Class summary

1. Rules for addition and subtraction of fractions with different denominators.

2. The key to a common denominator is to find the simplest common denominator. If the denominator is a polynomial and can be factored, you must first decompose it and then use the analogy of the least common multiple to find the simplest common denominator.

3. A molecule that is a monomial before its common denominator may become a polynomial after its common denominator. Remember to add parentheses during the operation.

4. The operation result should be converted into the simplest fraction.

Keywords: Free download of Beijing Normal University version of eighth grade mathematics volume 2 PPT courseware, PPT download of addition and subtraction of fractions, PPT download of fractions and fraction equations, .PPT format;

For more information about the PPT courseware "Fractions and Fractional Equations Addition and Subtraction of Fractions", please click on the Fractions and Fractional Equations PPT Addition and Subtraction of Fractions PPT tag.

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"Addition and Subtraction of Fractions" Fractions and Fractional Equations PPT (Courseware No. 1), 16 pages in total. Learning objectives: Master the rules of addition and subtraction of fractions with the same denominator, and be able to perform addition and subtraction calculations with the same denominator. Be able to convert fractions with opposite denominators into those with the same denominator for addition and subtraction operations. ..

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File Info

Update Time: 2024-09-30

This template belongs to Mathematics courseware Beijing Normal University Edition Eighth Grade Mathematics Volume 2 industry PPT template

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