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.
-
0:56 - 0:58Или умножаваме по 100.
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0:58 - 0:59Това е умножение по 10,
-
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
-
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 –
-
1:37 - 1:41умножаваме това по 100, за да получим 150,1,
-
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:
-
Think of a mixed numbers as a number AND a fraction. You can add numbers....you can add fractions with like denominators. Therefore, you can add mixed numbers! Watch.
Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/pre-algebra/fractions-pre-alg/mixed-number-add-sub-pre-alg/e/adding_subtracting_mixed_numbers_0.5?utm_source=YT&utm_medium=Desc&utm_campaign=PreAlgebra
Watch the next lesson: https://www.khanacademy.org/math/pre-algebra/fractions-pre-alg/mixed-number-add-sub-pre-alg/v/adding-subtracting-mixed-numbers-0-5-ex-2?utm_source=YT&utm_medium=Desc&utm_campaign=PreAlgebra
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Fran Ontanaya edited Bulgarian subtitles for Converting decimals to percents example 2 | Decimals | Pre-Algebra | Khan Academy | ||
Fran Ontanaya edited Bulgarian subtitles for Converting decimals to percents example 2 | Decimals | Pre-Algebra | Khan Academy |