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"Fraction Multiplication (1)" Fraction Multiplication PPT Courseware (Lesson 2)
Part One: Learning Objectives
1. Explore and understand the meaning of fractions multiplied by integers based on specific situations. Ability to correctly apply the “reduce first and then calculate” method for calculations.
2. Master the calculation method of integer multiplication fractions, and be able to calculate integer multiplication fractions proficiently and accurately.
3. Be able to use the knowledge learned to solve simple practical problems in life, feel the close connection between mathematics and daily life, and gain successful experience in learning activities.
[Key Points] Master the calculation method of integer multiplication fractions, and be able to calculate integer multiplication fractions skillfully and accurately.
[Difficulty] Be able to correctly use the "reduce first and then calculate" method to perform calculations.
Fraction multiplication PPT, part 2: exploration of new knowledge
Do the math.
1/7×8 2×4/15 3×2/13 4×5/9
To multiply a fraction by an integer, use the product of the numerator of the fraction multiplied by the integer as the numerator, and the denominator remains unchanged.
Can you understand the calculation process of the two students below? Talk to your companions.
The calculation result can be converted into the simplest fraction.
Those that can be reduced can be reduced first and then calculated.
Calculate the following questions and observe each question and its results. What did you find?
When a multiplier is reduced by 1/2, the product is also reduced by 1/2; when a multiplier is expanded by 1/2, the product is also expanded by 1/2.
Multiplication of Fractions PPT, Part 3: Classroom Exercises
1. Do the math.
1/8×12 6×4/15 4×1/12 5/18×9
Reducing first and then calculating can make the calculation easier.
2. A leaking faucet leaks 1/10 of a barrel of water every hour. How many barrels of water does it leak every 5 hours? What about 10 o'clock? What about 24 hours?
3. From 9:00 to 9:50, the clock passes 5 minutes; from 9:00 to 10:00, the clock passes 1 hour, which is 60 minutes; from 9:00 to 11:00, the clock passes 2 hours, which is 120 minutes.
4. Grandpa planted three vegetables, cucumbers, tomatoes, and beans, in a piece of land. Each vegetable occupies 1/6 of a hectare. How many hectares do the three vegetables occupy in total?
5. The grain store sold 5/8 tons of rice on the first day, and the rice sold on the second day was four times that of the first day. How many tons of rice did the grain store sell on the second day?
Fraction Multiplication PPT, Part 4: Class Summary
1. The meaning of multiplying fractions by whole numbers:
A simple operation to find the sum of several identical addends.
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. Offer points that can be reduced.
Multiplication of Fractions PPT, Part 5: Classwork
1. The side length of an equilateral triangle is 5/12 decimeter. What is its perimeter in decimeters?
2. Dad and Lele both have colds, and mom has to buy them medicine for three days.
⑴How many bags do Dad and Lele eat each day?
⑵ How many bags of medicine does mother need to buy in total?
3. If a highway is built 1/15 of its total length every day, what fraction of the total length will be built in 9 days?
4. Xiaohua and Xiaoming ride bicycles to school. Xiaohua travels 4/15 kilometers per minute, and Xiaoming travels 15 kilometers per hour. Which of the two rides faster?
5. A kind of flax contains about 8/25 kilograms of oil per kilogram. How many kilograms of oil does 1 ton of flax contain?
6. The distance from Xiaoxia’s home to school is 3/8 kilometers. When she arrived at school in the morning, she found that she had forgotten to bring her pencil case. So I immediately went home to pick up my pencil case, and then returned to school. Please do the math. How many kilometers did she walk in the morning?
Keywords: Beijing Normal University edition fifth grade mathematics PPT courseware for volume 2 free download, fraction multiplication PPT download, .PPT format;
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