"Eating Watermelon" Understanding Fractions PPT Download

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"Eating Watermelon" Understanding Fractions PPT Download

Part One: Learning Objectives

1. Combined with the problem-solving process, explore the calculation method of adding and subtracting fractions with the same denominator.

2. Be able to correctly calculate the addition and subtraction of simple fractions with the same denominator.

【Key points】Be able to calculate simple addition and subtraction of fractions with the same denominator.

【Difficulty】Be able to solve simple practical problems related to addition and subtraction of fractions.

Eating watermelon PPT, part 2: introduction of new knowledge

What math questions can you ask?

1. What fraction of the watermelon did Big Bear and Little Bear eat in total?

2. How much more of the watermelon did the big bear eat than the little bear?

3. How much is left?

What fraction of the watermelon did Big Bear and Little Bear eat in total?

1 watermelon is divided into 8 pieces on average. The little bear eats 2/8 of the watermelon and the big bear eats 3/8 of the watermelon. Find what fraction of the watermelon the little bear and the big bear eat in total, that is, find the sum of 2/8 What is the sum of 3/8? Calculate it by addition. The formula is 2/8+3/8.

How much more of the watermelon did the big bear eat than the little bear?

When subtracting fractions with the same denominator, because the total number of equal parts is the same, the denominators do not change when subtracting, just subtract their numerators.

Eating watermelon PPT, Part 3: Classroom exercises

Take a look and fill it out.

1/4+ 2/4=3/4

3/5+ 2/5=5/5

5/8− 2/8=3/8

1− 2/6=4/6

Paint it and do the math.

1/3+ 1/3=2/3

7/8−3/8=4/8

What fraction of this paper did they use in total? What fraction is left?

I used 3/9 of this paper

I used 5/9 of this paper

3/9+ 5/9= 8/9

1- 8/9= 1/9

Answer: They have used a total of 8/9 of the paper and have 1/9 left.

Eating Watermelon PPT, Part 4: Class Summary

(1) If fractions with the same denominator are added, the denominator remains unchanged and the numerators are added.

(2) When subtracting fractions with the same denominator, the denominator remains unchanged and the numerator is subtracted.

(3) To calculate how many fractions are subtracted from 1, you can change "1" into a fraction whose numerator and denominator are the same as the denominator of the subtraction, and then calculate according to the calculation method of subtracting fractions with the same denominator.

Eating watermelon PPT, Part 5: Classwork

1. A storybook, Xiao Hai read 1/5 of it, and Xiao Liang read 2/5 of it. How many fractions did they read in total? What fraction is left?

1/5+ 2/5= 3/5

1- 3/5= 2/5

Answer: The two of them have read 3/5 in total and have 2/5 left.

2. A rope is 1 meter long. 3/9 of the meter is used for the first time and 2/9 of the meter is used for the second time. How many meters are left?

3/9+ 2/9= 5/9 (meter)

1- 5/9= 4/9 (meter)

Answer: 4/9 meters left.

Keywords: Beijing Normal University version third grade mathematics PPT courseware free download, eating watermelon PPT download, understanding fractions PPT download, .PPT format;

For more information about "Knowing Fractions and Eating Watermelon" PPT courseware, please click on the "Knowing Fractions and Eating Watermelon" PPT courseware.

"Eating Watermelon" Understanding Fractions PPT:

"Eating Watermelon" Understanding Fractions PPT Part One Content: Learning Objectives 1. Experience the process of solving practical problems, explore and master the calculation methods of adding and subtracting fractions with the same denominator, and be able to calculate correctly. 2. Be able to use addition and subtraction of fractions with the same denominator to solve some simple practical problems..

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Update Time: 2024-10-13

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

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