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"Multiplication of Fractions (2)" Multiplication of Fractions PPT Courseware (Lesson 1)
Part One: Learning Objectives
1. Further explore and understand the meaning of multiplying fractions and integers, and be able to calculate correctly.
2. Further consolidate the calculation method of multiplying fractions and integers. Able to skillfully and accurately calculate integers and fractions.
3. Be able to solve practical problems of multiplying simple fractions and integers.
[Key Points] Understand the meaning of fraction multiplication, master the calculation method of integer multiplication fractions, and be able to calculate integer multiplication fractions proficiently and accurately.
[Difficulty] Master the calculation method of multiplying fractions by integers and be able to calculate correctly.
Fraction multiplication PPT, part 2: exploration of new knowledge
See who can calculate correctly and quickly.
3/15×7 2/7×4
To multiply a fraction by an integer, use the product of the numerator of the fraction multiplied by the integer as the numerator. The denominator remains unchanged and the fraction can be reduced.
How many cookies did Xiaoxiao eat?
I ate 6 cookies in the morning.
The number of cookies I ate was 1/2 that of Chisi.
The number of cookies I ate was 2/3 of Chisi's.
Multiplication of Fractions PPT, Part 3: Classroom Exercises
1. Paint it and do the math.
(1) What is 1/4 of 8?
(2) What is 2/3 of 15?
2. How many centimeters is Qisi’s height?
Qisi's height is about 3/4 of the door height.
3. The original price of a schoolbag is 30 yuan. How much does it cost after a 10% discount? Let’s talk about it first, and then calculate it with formulas.
10% off means the current price is 9/10 of the original price.
Please give another problem that can be solved using this formula.
Build a 30-meter-long road. 9/10 of it has been built. How many meters have been built?
4. A flood washed away 2/3 of the 960-meter-long road in the village. How many meters long was the washed-out road?
Find what fraction of a number is using multiplication.
Answer: The washed-out road was 640 meters long.
Fraction Multiplication PPT, Part 4: Class Summary
1. To find out what fraction of a number is, multiply the number by the fraction.
2. Calculation method of multiplying fractions by integers: The product of the numerator and the integer is used as the numerator, and the denominator remains unchanged.
Fraction Multiplication PPT, Part 5: Homework
1. See who can calculate correctly and quickly.
3/8×12 9×4/15 4×1/12 5/18×3
2. The table below records the air quality standards of a certain city from April to July.
Let’s first estimate, which month has the most days with air quality reaching standards? Then calculate how many days each has.
April has 30 days, May has 31 days, June has 30 days, and July has 31 days.
Answer: The number of days with standard weather conditions in April, May, June and July are 21, 22, 24 and 26 days respectively.
3. The original price of Mickey's schoolbag is 100 yuan, and it is sold at a 20% discount during New Year's Day. How much is the price of Mickey's schoolbag after the 20% discount?
20% off means the current price is 8/10 of the original price.
Answer: After 20% discount, it is 80 yuan.
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.
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