"Reunderstanding of Fractions (2)" The Meaning of Fractions PPT

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"Reunderstanding of Fractions (2)" The Meaning of Fractions PPT

Part One: Classroom Introduction

1. Further understand the meaning of fractions; recognize fraction units; be able to compare the sizes of fraction units.

2. Let students experience measurement textbooks, create "fraction walls" and other mathematical methods, and expand their thinking and cultivate the ability of abstract generalization through hands-on, operation, analysis, comparison, discrimination and other activities.

3. Develop number sense and realize the close connection between fractions and life.

PPT on re-understanding of fractions, part 2: exploration of new knowledge

The meaning of fractions

Divide the whole (unit) "1" evenly into several parts, and the number representing one or several parts is called a fraction.

Unit "1"

An object: such as an apple, a piece of paper, a piece of cloth

A unit of measurement: such as 1 meter, 1 kilogram, 1 square meter

A whole made up of many objects: such as a pile of sand, the class, 12 flags, 6 apples

The fractions are the same, but the corresponding wholes are different, and the specific quantities represented are different.

Activity 1: Naughty wanted to buy a book cover for his new book. He didn’t have a ruler, so he used a piece of paper to find out the width and length of the math book. But something went wrong during the measurement, and everyone came to help a bunch of naughty people. Completed in groups.

Activity 2: Below is a "score wall". Fill it in and think about it. What did you find?

Re-understanding of fractions PPT, part 3: Classroom exercises

1. Talk about the fractional units of the following fractions. There are several such fractional units.

The fractional units are: 1/5 1/9 1/99 1/200

They have 2, 5, 37, and 193 fractional units respectively.

2.1 yuan = ( ) angle

1 dime is 1 yuan ( )

7 jiao is 1 yuan ( )

3. Fill in the following:

(1) Divide 40 apples equally into 5 parts, 2 parts of which account for ( ) of these apples, and its fractional unit is ( ).

(2) There are ( ) 1/9 in 7/9.

(3) 7 1/19 is ( ), pronounced as ( ).

(4)( ) 1/23 is 1, and there are ( ) 1/20 in 1.

4. Judgment: If the answer is correct, put a “√” in the bracket, and if the answer is wrong, put an “X” in the bracket.

(1) Different fractions must have different fraction units. ( )

(2) If the fractions have the same size, the fraction units must be the same. ( )

(3) Fractions with the same denominator must have the same fraction unit. ( )

(4) Fractions with the same numerator must have the same fraction unit. ( )

(5) The larger the denominator, the larger the fractional unit. ( )

(6) The largest fractional unit is , and there is no smallest fractional unit. ( )

Re-understanding of Fractions PPT, Part 4: Class Summary

1. Divide the integer "1" evenly into several parts, and there will be several fractions in it.

2. How many numerators are there in a fraction? There are several such fraction units.

3. Fractions with different denominators have different fractional units.

4. The larger the denominator, the smaller the fraction unit; the smaller the denominator, the larger the fraction unit.

Re-understanding of Fractions PPT, Part 5: Classwork

1.10cm＝( )dm

1cm is 1dm

3cm is 1dm

2. Observe the fractions in the picture below and fill in the appropriate numbers in the brackets.

⑴ 3 1/10s are ( ), there are ( ) 1/10s in 7/10, and ( ) 1/10s are 1.

⑵ Among these scores, the one closest to 0 is ( ), and the one closest to 1 is ( ).

3. Fill it out.

5 decimeters = ( ) meters

145 grams = ( ) kilogram

17 minutes = ( ) hour

28 square decimeters = ( ) square meters

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For more information about the PPT courseware "The Meaning of Fractions and Re-understanding of Fractions", please click on the "The Meaning of Fractions and Re-understanding of Fractions" PPT tag.

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Update Time: 2024-11-25

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