Converting decimals to percents example 2 | Decimals | Pre-Algebra | Khan Academy
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0:00 - 0:06Нека проверим дали можем
да превърнем 1,501 в проценти. -
0:06 - 0:11Сега искаме просто да изпишем
тази стойност като нещо върху 100. -
0:11 - 0:16Можем да кажем,
че това е същото като 1,501 върху 1. -
0:16 - 0:18Не сме променили стойността му.
-
0:18 - 0:22Нека сега го умножим по 100 върху 100.
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0:22 - 0:25Когато правим това произведение,
не променяме стойността на израза – -
0:25 - 0:27просто умножаваме няколко пъти по едно.
-
0:27 - 0:30Но правейки го,
променяме начина, по който го представяме. -
0:30 - 0:35Знаменателят ще стане 1 по 100, което е лесно.
-
0:35 - 0:37Това ще стане 100
-
0:37 - 0:42И след това в числителя
искаме да умножим 1,501 по 100. -
0:42 - 0:45И така, ако умножим това по 10,
-
0:45 - 0:47ще преместим десетичната запетая с една позиция надясно.
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0:47 - 0:51Но ние искаме да умножим по 100, така че умножаваме по 10 още веднъж,
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0:51 - 0:53и така преместваме десетичната запетая надясно с две позиции.
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0:53 - 0:56Умножаваме по 10 два пъти.
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0:56 - 0:58Или умножаваме по 100.
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0:58 - 0:59Това е умножение по 10,
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0:59 - 1:00това е умножение по 100.
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1:00 - 1:02И ето къде преместваме десетичната запетая.
-
1:02 - 1:06И получаваме 150,1
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1:06 - 1:12Преобразували сме 1,501 до "150,1 върху 100"
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1:12 - 1:15или 150,1 на 100.
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1:15 - 1:21Нека да запиша: 150,1 на 100.
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1:21 - 1:26Което е същото като 150,1 процента.
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1:26 - 1:33Или може да се изпише като 150,1%.
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1:33 - 1:34И сме готови.
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1:34 - 1:36В действителност какво направихме
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1:36 - 1:37– ако искаме да опростим процеса –
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1:37 - 1:41умножаваме това по 100, за да получим 150,1,
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1:41 - 1:44и след това казваме, че това са процентите.
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1:44 - 1:48Затова трябва да не пропускаме да изпишем "%" там.
- Title:
- Converting decimals to percents example 2 | Decimals | Pre-Algebra | Khan Academy
- Description:
-
Understanding how to convert a decimal to a percent comes in really handy sometimes. Let's practice using this problem.
Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/pre-algebra/decimals-pre-alg/percent-intro-pre-alg/e/converting_decimals_to_percents?utm_source=YT&utm_medium=Desc&utm_campaign=PreAlgebra
Watch the next lesson: https://www.khanacademy.org/math/pre-algebra/decimals-pre-alg/percent-intro-pre-alg/v/converting-percents-to-decimals-ex-1?utm_source=YT&utm_medium=Desc&utm_campaign=PreAlgebra
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https://www.khanacademy.org/math/pre-algebra/decimals-pre-alg/percent-intro-pre-alg/v/converting-decimals-to-percents-ex-1?utm_source=YT&utm_medium=Desc&utm_campaign=PreAlgebraPre-Algebra on Khan Academy: No way, this isn't your run of the mill arithmetic. This is Pre-algebra. You're about to play with the professionals. Think of pre-algebra as a runway. You're the airplane and algebra is your sunny vacation destination. Without the runway you're not going anywhere. Seriously, the foundation for all higher mathematics is laid with many of the concepts that we will introduce to you here: negative numbers, absolute value, factors, multiples, decimals, and fractions to name a few. So buckle up and move your seat into the upright position. We're about to take off!
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Fran Ontanaya edited Bulgarian subtitles for Converting decimals to percents example 2 | Decimals | Pre-Algebra | Khan Academy |