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"Fractions and Fraction Multiplication" Fraction Multiplication PPT Courseware,
Review the past and learn the new
What does it mean to multiply fractions by whole numbers? Can you give an example?
The meaning of multiplying fractions by integers is the same as that of multiplying integers, which is a simple operation to find the sum of several identical addends. What is the calculation rule for multiplying fractions and whole numbers? What issues should be paid attention to when calculating?
Calculation rules for multiplying fractions by integers: multiply fractions by integers, use the product of the numerator and the integer as the numerator, and keep the denominator unchanged.
If it can be reduced, it is easier to reduce it first and then calculate it. If the calculation result is not the simplest fraction, it should be converted into the simplest fraction.
To multiply fractions, use the product of the numerators as the numerator and the product of the denominators as the denominator.
A tractor plows 1/2 hectare per hour. How many hectares does it plow in 1/3 hour? What about 2/3 hours? First express it in the picture, and then calculate it in formula.
1/2×1/3=1/6 1/2×2/3=1/3
Answer: The cultivated land is 1/6 hectare in 1/3 hours, and the cultivated land is 1/3 hectare in 2/3 hours.
A car consumes 1/12 liter of fuel when traveling 1 kilometer. Based on this calculation, how many liters of fuel is consumed to travel 4/5 kilometers? How about 50 kilometers?
1/12×4/5=1/15 1/12×50=25/6
Answer: A trip of 4/5 kilometers consumes 1/15 liter of fuel, and a trip of 50 kilometers consumes 25/6 liters of fuel.
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"Fractions and Fraction Multiplication" Fraction Multiplication PPT Courseware 2:
"Fractions and Multiplying Fractions" Fraction Multiplication PPT Courseware 2 Is the meaning of multiplying a fraction by a number the same as that of multiplying an integer? Multiplying a number by a fraction can be viewed as finding what fraction of the number is. You discover the numerator, denominator of the product and the numerators of the two factors..