Short Tricks to calculate HCF of Decimals & Fractions

Duration: 11 min

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Module outline

  1. Communication Round: Vocabulary, Subject Verb Agreement (Verb Noun Agreement), Tenses, Comprehension / Reading Comprehension / Unseen Passages (Critical Reasoning) (Paragraph Questions), Cloze Test (Cloze Passage), Sentence Correction (Error Correction), Sentence Completion (Fill in the blanks), Sentence Re-arrangements (Para Jumbles) (Narrative Sequencing), Direct and Indirect Speech, Active Passive Voice (Voice), Verbal Analogy (Word Based Analogy), Articles, Preposition, Conjunction, Sentence Construction, English Writing Ability, Communication Assessment
  2. Quantitative Aptitude: Ratio and Proportion (Ratios), Divisibility Rules, Data Interpretation, Mixture and Alligation, Permutation and Combination, Logarithm, Number System, HCF LCM, Speed Time and Distance, Percentage, Average, Powers and Exponents (Surds and Indices), Time and Work, Mensuration and Geometry, Age Problems, Pipe and Cistern, Probability, Profit and Loss, Simple Interest and Compound Interest, Algebra
  3. Analytical and Logical Reasoning: Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Data Sufficiency, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Directions (Direction Test), Ranking, Order and Sequence, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Selection Decision Table (Decision Making), Logical Sequence Of Words, Puzzle Solving (Puzzles), Syllogisms, Seating Arrangements, Calendar, Clock, Blood Relations, Cubes & Dices, Venn Diagram, Analytical Reasoning (Counting Figures Reasoning)
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  5. Java (Cluster 1): Java
  6. ANSI SQL MySQL (Cluster 1,2,3): SQL
  7. HTML, CSS, JavaScript (Cluster 1,3): HTML, CSS, JavaScript
  8. Python (Cluster 2): Python for Placements by Yash Sir
  9. Cloud Fundamentals (Cluster 2): Emerging Tech Trends
  10. C# (Cluster 3): C#
  11. OOPs: Object Oriented Programming (OOPS)
  12. Technical Assessment (Coding): Coding Questions by Yash Sir, C Programming by Yash Sir, Programming in C++, Pseudo Codes
  13. Data Structures: Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing
  14. DBMS: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, File Organization & Indexing, Relational Algebra, Relational Calculus, Transaction Management, Concurrency Control, Database Recovery, ORDBMS, Database Security & Authorization, Query Processing & Optimization, Enhanced Data Models, Data Warehousing & Mining, Big Data Systems, NoSQL
  15. Operating Systems: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Deadlock, Threads & Process Creation, Memory Management, Virtual Memory, Disc Scheduling, File Management, Windows OS, Linux OS, Security, Distributed Systems, Virtual Machines
  16. Computer Networks: 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, Network Security, Mobile Technology, Cloud Computing and IoT, Cyber and Info Security
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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