"Comparing Size" Understanding Fractions PPT Download

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"Comparing Size" Understanding Fractions PPT Download

Part One: Learning Objectives

1. With the help of intuitive graphics, experience the process of comparing the sizes of simple fractions using the area model.

2. Can compare fractions with the same denominator or fractions with the same numerator whose numerator is 1.

[Key Points] Compare the sizes of simple fractions.

【Difficulty】Be able to compare the sizes of simple fractions.

Comparison of size PPT, part two: introduction of new knowledge

Can you classify?

1/2, 1/4, 2/3, 1/3, 2/5, 3/5, 3/8

Fractions with the same denominator: 2/3 and 1/3; 2/5 and 3/5

Fractions with the same numerator: 1/2 and 1/4, 2/3 and 2/5, 3/5 and 3/8.

Think of the square as a whole "1" and divide it into 4 parts equally. In the left picture, 3 parts are painted, and the colored part occupies 3/4 of the whole picture; in the right picture, 1 part is painted, and the colored part occupies the whole picture. 1/4. The two squares are the same size and are divided into 4 equal parts. Each part is also the same size, so the area of ​​3 parts is greater than the area of ​​1 part, that is, 3/4> 1/4.

In the same way, the area of ​​3 parts colored in the left picture in the circle picture is greater than the area of ​​1 part colored in the right picture, that is, 3/4> 1/4.

Derive methods to compare fractions with the same denominator

3/4>1/4, 3/4 and 1/4 have the same denominator but different numerators. Numerator 3 is greater than numerator 1. It can be inferred that when comparing fractions, the denominators are the same. You can judge the two by looking at the size of the numerators. The size of the fraction.

Compare two fractions

1. Observe the three groups of numbers 3/4>1/4, 5/6>3/6, and 4/6>1/6 and find the similarities and differences in each group of numbers.

Similarity: The denominators of each set of fractions are the same. (That is, the overall average score is the same)

Difference: The number of molecules in each group is different. (That is, the number of copies taken is different)

2. Comparison method: The denominators of two fractions are the same. Looking at the numerator, the larger the numerator, the larger the fraction; the smaller the numerator, the smaller the fraction.

Comparison of sizes PPT, part three: classroom exercises

1. Apply it and compare.

2. Xiaoxiao brought a basket of apples, 7 in total.

3. Write appropriate fractions and compare the sizes of each set of fractions.

Comparison of sizes PPT, part 4: Class summary

When comparing fractions with the same denominator, the fraction with the larger numerator is larger, and the fraction with the smaller numerator is smaller;

Compared with the numerator fraction, the larger the denominator, the smaller the fraction, and the smaller the denominator, the larger the fraction.

Comparing size PPT, part 5: Classwork

There are two pieces of wood of the same length. The first one is 1/6 used, and the second one is 2/6 used. Which one has more left?

The more you use, the less you will have left. You can compare which one you have used more, and the one you will have less left.

1/6＜2/6

Answer: The first one has more left.

Keywords: Free download of Beijing Normal University version third grade mathematics PPT courseware, comparison of size PPT download, understanding of fractions PPT download, .PPT format;

For more information about the PPT courseware "Comparing Sizes and Understanding Fractions", please click the "Comparing Sizes and Understanding Fractions" PPT courseware.

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"Comparing Sizes" The meaning of decimals and addition and subtraction PPT download

Part One: Learning Objectives

1. Explore and summarize methods of comparing decimals and accumulate experience in mathematical activities.

2. Can compare the size of decimals.

3. Feel the process of solving practical problems..

"Comparing Sizes" The meaning of decimals and addition and subtraction PPT:

"Comparing Big and Small" The meaning of decimals and addition and subtraction PPT

Part One: Learning Objectives

Learn how to compare decimals. (emphasis)

Use the method of comparing decimals to solve simple practical problems. (difficulty)

Fill it out.

30 decimeters =..

"Comparing Size" Understanding Fractions PPT:

"Comparing Size" Understanding Fractions PPT

Part One: Learning Objectives

A method to compare fractions through observation and operation communication. Understand that when the numerator is 1, the larger the denominator, the smaller the fraction. (important and difficult points)

In the process of comparing simple fractions, add...

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Update Time: 2024-09-07

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

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