Short Tricks to calculate HCF of Decimals & Fractions

Duration: 11 min

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Inside: a video lesson and guided study material.

Module outline

  1. Section A | English: Vocabulary, Comprehension / Reading Comprehension / Unseen Passages (Critical Reasoning) (Paragraph Questions), Preposition, Sentence Correction (Error Correction), Sentence Completion (Fill in the blanks), Articles, Sentence Re-arrangements (Para Jumbles) (Narrative Sequencing), Verbal Analogy (Word Based Analogy)
  2. Section A | Quant Aptitude: Ratio and Proportion (Ratios), Mixture and Alligation, Permutation and Combination, Number System, HCF LCM, Sequence and Series (Series), Speed Time and Distance, Arithmetic, Algebra, Powers and Exponents (Surds and Indices), Average, Age Problems, Percentage, Profit and Loss, Partnership, Time and Work, Simple Interest and Compound Interest, Mensuration and Geometry, Probability, Pipe and Cistern
  3. Section A | Reasoning: Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Data Sufficiency, Calendar, Clock, Blood Relations, Directions (Direction Test), Seating Arrangements, Ranking, Order and Sequence, Puzzle Solving (Puzzles)
  4. Section B | C Programming: C Programming by Yash Sir, Coding Questions by Yash Sir
  5. Section B | Data Structures: Algorithm Analysis, Greedy Algorithms, Time Complexity Analysis, Sorting Algorithms, Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs
  6. Section B | OOP (C++): Object Oriented Programming (OOPS), Programming in C++
  7. Section B | OS: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Threads & Process Creation, Deadlock, Memory Management, Virtual Memory, Disc Scheduling, File Management, Windows OS
  8. Section B | Networking: Introduction to CN, Data Communication, DLL: Access Control, DLL: Flow Control, DLL: Error Control, DLL: Framing, Data Link Layer - Ethernet, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Net Layer:Routing Protocol, Transport Layer Services, TL: Congestion & UDP, Application Layer, Hardware basics
  9. Section B | AI & Big Data Basics: AI & ML by Arun Sir, Big Data Systems
  10. Section C | Digital Electronics: Digital Systems & Boolean Basics, Logic Gates & Hardware, Boolean Expression, Boolean Minimization, Combinational Circuit, Sequential Circuits, Number System, Number Representation, Analog-Digital Conversion
  11. Section A, C | Comp. Fundamentals, COA: Basics of COA, Floating Point Rep, Cache Memory Organization, Input Output Organisation, Pipelining, Instr Formats & Modes, Control Unit Design, Register Transfer and Microoperations, Multiprocessors, Programming the Basic Computer
  12. MOCK TEST:
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This educational video, presented by Yash Jain from Knowledge Gate Eduventures, provides a comprehensive tutorial on finding the Highest Common Factor (HCF) of decimal numbers. The lecture begins with an introduction to the topic, followed by a detailed explanation of the method. The core technique involves converting decimal numbers into whole numbers by multiplying them by a power of 10 (e.g., 10, 100, 1000) to eliminate the decimal point. The HCF of these resulting whole numbers is then calculated using the prime factorization method. Finally, the result is converted back to a decimal by dividing by the same power of 10 used in the initial step. The video demonstrates this process with two examples: first, HCF(0.15, 2.5, 10), which is solved by multiplying by 100 to get HCF(15, 250, 1000), yielding 5, and then dividing by 100 to get 0.05. Second, HCF(2.4, 0.84, 0.108) is solved by multiplying by 1000 to get HCF(2400, 840, 108), yielding 12, and then dividing by 1000 to get 0.012. The video concludes with a summary of the concept and a 'Thanks for Watching' screen.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The video opens with a title card displaying 'LCM & HCF' against a digital background. It then transitions to a classroom setting where a female cartoon teacher stands beside a green chalkboard. The board displays the title 'HCF' and the word 'And' with a small boy character. The instructor, Yash Jain, is visible in a small window. The scene sets the stage for a lesson on the Highest Common Factor, with the title 'Highest Common Factor (HCF)' clearly written on the board.

  2. 2:00 – 5:00 02:00-05:00

    The video presents the first example: HCF(0.15, 2.5, 10). The instructor explains the method of converting decimals to whole numbers. The on-screen text shows the numbers being multiplied by 100: 0.15 x 100 = 15, 2.5 x 100 = 250, and 10 x 100 = 1000. The problem is thus transformed into finding the HCF of the whole numbers 15, 250, and 1000. The instructor then begins the prime factorization process, writing the numbers and dividing them by common prime factors like 5.

  3. 5:00 – 10:00 05:00-10:00

    The instructor completes the prime factorization for the first example, showing that the HCF of 15, 250, and 1000 is 5. The final step is to convert this result back to a decimal by dividing by 100, resulting in 0.05. The video then moves to the second example, HCF(2.4, 0.84, 0.108). The instructor demonstrates the conversion by multiplying each number by 1000: 2.4 x 1000 = 2400, 0.84 x 1000 = 840, and 0.108 x 1000 = 108. The problem is now HCF(2400, 840, 108). The instructor proceeds to find the HCF of these three numbers using prime factorization, dividing by common factors like 2 and 3, and arrives at the result 12. The final answer is obtained by dividing 12 by 1000, giving 0.012.

  4. 10:00 – 10:56 10:00-10:56

    The video concludes with a summary of the concept. The instructor reiterates the formula: HCF of decimals = HCF of the numerators / LCM of the denominators, after converting the decimals to fractions. The final answer for the second example, 0.012, is confirmed. The video ends with a black screen displaying the text 'THANKS FOR WATCHING' in an orange and white box.

The video provides a clear, step-by-step guide on calculating the HCF of decimal numbers. The central idea is to transform the problem into one involving whole numbers, which is a standard and effective method. The instructor uses two distinct examples to illustrate the process, ensuring the concept is well-understood. The key takeaway is the systematic approach: convert decimals to whole numbers by multiplying by a power of 10, find the HCF of the whole numbers, and then divide the result by the same power of 10 to get the final decimal answer. This method is reliable and avoids the complexity of dealing with decimals directly in factorization.

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