"Fraction Multiplication (3)" Fraction Multiplication PPT

Description

"Fraction Multiplication (3)" Fraction Multiplication PPT

Part One: Learning Objectives

1. Combining specific situations, explore and understand the meaning of multiplying fractions by fractions;

2. Master the calculation method of multiplying fractions by fractions, and be able to calculate correctly;

3. Be able to solve simple practical problems of fractions and fraction multiplication, and appreciate the close connection between mathematics and life.

Fraction multiplication PPT, part 2: exploration of new knowledge

Example 1 Read it and think about it. What percentage of the note is the remaining part?

There is this passage in the famous ancient Chinese philosophical work "Zhuangzi·Tianxia":

This means that if you cut half of a foot-long stick every day, you will never be able to finish it.

What did you discover from the paper-cutting process just now?

I discovered: The meaning of multiplying a fraction by a fraction is to find out what fraction of a fraction it is.

Example 2 3/4×1/4=? Fold a rectangular piece of paper, think about it, and do the math.

group discussion

(1) What percentage of the diagonal part is the red part? What fraction of the entire paper does it occupy?

Answer: The red part occupies one-quarter of the diagonal part; it occupies three-sixteenths of the entire paper.

(2) What is the calculation method for multiplying two fractions?

Answer: When multiplying two fractions, multiply the numerator by the denominator and the denominator by multiplying the denominator. If the fraction can be reduced, you can reduce the fraction first.

Example 3 Do the math and observe the equations. What did you find?

If a number is multiplied by a fraction less than 1, the product must be less than this number.

If a number is multiplied by a fraction equal to 1, the product must be equal to this number.

If a number is multiplied by a fraction greater than 1, the product must be greater than this number.

Fraction Multiplication PPT, Part 3: Consolidation Practice

Solve the problem

It was Naughty's birthday. Mom bought a cake and cut 1/3 of it for Naughty. Naughty only ate 1/2 of it. What fraction of the cake did Naughty eat?

3/5 of the total area of ​​the campus is open space, and 2/3 of the open space is to be paved with lawn. What fraction of the total campus area does the lawn area account for?

Fraction Multiplication PPT, Part 4: Class Summary

The meaning of multiplying fractions by fractions is to find out what fraction of a number is;

To multiply two fractions, multiply the numerator by the numerator and the denominator by the denominator. Those that can be reduced can be reduced first;

If a number is multiplied by a fraction less than 1, the product must be less than this number;

If a number is multiplied by a fraction equal to 1, the product must be equal to this number;

If a number is multiplied by a fraction greater than 1, the product must be greater than this number.

Keywords: Beijing Normal University edition fifth grade mathematics PPT courseware for volume 2 free download, fraction multiplication PPT download, .PPT format;

For more information about the "Multiplying Fractions" PPT courseware, please click the Multiplying Fractions PPT tab.

"Reciprocal" Fraction Multiplication PPT Download:

"Reciprocal" Fraction Multiplication PPT Download Part One: Learning Objectives 1. Recognize reciprocals, understand the meaning of reciprocals, and master the method of finding the reciprocal of a number. (Key points) 2. Understand that two numbers that are reciprocal to each other are interdependent. (Difficulty) ... ... ...

"Reciprocal" Fraction Multiplication PPT:

"Reciprocal" Fraction Multiplication PPT Part One Content: Learning Objectives 1. To enable students to understand the meaning of reciprocals, master the method of finding reciprocals, and be able to correctly and skillfully find reciprocals. 2. Further cultivate students' independent learning ability and improve students' observation, comparison, generalization and...

"Multiplying Fractions (3)" PPT Download of Multiplying Fractions (Lesson 2):

"Multiplying Fractions (3)" Fractional Multiplication PPT Download (Lesson 2) Part One: Learning Objectives 1. Further master the calculation method of multiplying fractions by fractions, and be able to calculate correctly. (Key Points) 2. Understand the rules of how a number is multiplied by a fraction and the size of the product changes, and...

File Info

Update Time: 2024-11-10

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

Preview