Converting decimals to fractions example 3 | Decimals | Pre-Algebra | Khan Academy
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0:01 - 0:08Chúng ta sẽ tìm cách để viết 0,36 dưới dạng phân số.
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0:08 - 0:09Có nhiều cách để làm việc này.
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0:09 - 0:13Cách mình thường dùng là,
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0:13 - 0:160,36 bằng với 36/100.
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0:16 - 0:18Còn cách khác nữa là
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0:18 - 0:20số này nằm ở hàng phần trăm.
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0:23 - 0:26Số này nằm ở hàng phần mười
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0:26 - 0:28hoặc ta cũng có thể xem đây như 30/100.
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0:28 - 0:30Ta có thể xem số 3 này là 30/100.
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0:30 - 0:34Vậy tức là ta có thể xem đây như 36/100,
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0:34 - 0:3836/100.
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0:38 - 0:41Chúng ta đã biểu diễn nó dưới dạng phân số,
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0:41 - 0:42nhưng thật ra chúng ta cũng có thể rút gọn nó đi
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0:42 - 0:46vì 36 và 100 có thừa số chung.
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0:46 - 0:48Cả hai số này
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0:48 - 0:50đểu có thể chia hết cho 4.
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0:50 - 0:52Vậy nếu chúng ta
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0:52 - 0:55chia cả từ số
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0:55 - 0:56và mẫu số cho 4.
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0:56 - 0:58Chúng ta không làm thay đổi giá trị của phân số.
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0:58 - 1:0436 chia cho 4 bằng 9, và 100 chia cho 4 bằng 25.
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1:04 - 1:06Hai số mới này có vẻ
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1:06 - 1:08không có thừa số chung nào.
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1:08 - 1:12Vậy nên chúng ta sẽ viết phân số dạng tối giản ra,
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1:12 - 1:14và thế là xong.
- Title:
- Converting decimals to fractions example 3 | Decimals | Pre-Algebra | Khan Academy
- Description:
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Converting this decimal results in a fraction that needs to be simplified. Can you help us?
Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/pre-algebra/decimals-pre-alg/decimal-to-fraction-pre-alg/e/converting_decimals_to_fractions_1?utm_source=YT&utm_medium=Desc&utm_campaign=PreAlgebra
Watch the next lesson: https://www.khanacademy.org/math/pre-algebra/decimals-pre-alg/decimal-to-fraction-pre-alg/v/converting-decimals-to-fractions-2-ex-1?utm_source=YT&utm_medium=Desc&utm_campaign=PreAlgebra
Missed the previous lesson?
https://www.khanacademy.org/math/pre-algebra/decimals-pre-alg/decimal-to-fraction-pre-alg/v/converting-decimals-to-fractions-1-ex-2?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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- Duration:
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