Divisibility Rules of 28, 29, 30 and 31

Duration: 10 min

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Inside: a video lesson and guided study material.

Module outline

  1. Child Development and Pedagogy: विकास की अवधारणा / Concept of Development, विकास के मनोवैज्ञानिक सिद्धांत / Psychological Theories of Development, व्यक्तिगत भिन्नताएँ, व्यक्तित्व एवं जेंडर / Individual Differences, Personality and Gender, बुद्धि एवं सृजनात्मकता / Intelligence and Creativity, अधिगम एवं इसके सिद्धांत / Learning and Its Theories, बालक कैसे सोचते एवं सीखते हैं / How Children Think and Learn, संवेग, अभिप्रेरणा, मानसिक स्वास्थ्य एवं निर्देशन / Emotion, Motivation, Mental Health and Guidance, समावेशी शिक्षा / Inclusive Education, शिक्षण-अधिगम प्रक्रिया / Teaching-Learning Process, शिक्षण विधियाँ एवं रणनीतियाँ / Teaching Methods and Strategies, आकलन एवं मूल्यांकन / Assessment and Evaluation, पाठ्यचर्या और विद्यालयी गतिविधियाँ / Curriculum and School Activities, पाठ योजना और शिक्षण कौशल / Lesson Planning and Teaching Skills, शिक्षण संसाधन और शैक्षिक प्रौद्योगिकी / Teaching Resources and Educational Technology, कक्षा प्रबंधन और सम्प्रेषण / Classroom Management and Communication, शिक्षक पहचान और व्यावसायिक विकास / Teacher Identity and Professional Development, शैक्षिक विचारक, उद्देश्य एवं राष्ट्रीय नीतियाँ / Educational Thinkers, Aims and National Policies, विद्यालय नेतृत्व और प्रशासन / School Leadership and Administration, जीवन कौशल, मूल्य, शांति एवं पर्यावरण शिक्षा / Life Skills, Values, Peace and Environmental Education, पर्यावरण अध्ययन का शिक्षणशास्त्र / Pedagogy of Environmental Studies, विज्ञान शिक्षण शास्त्र / Science Pedagogy, संविधान, आयोग, अधिनियम एवं योजनाएँ / Constitution, Commissions, Acts and Schemes in Education, कंप्यूटर हार्डवेयर एवं परिधीय उपकरण / Computer Hardware and Peripherals
  2. Language I — Hindi: भाषा, लिपि और वर्ण-विचार, संधि, शब्द-स्रोत और शब्द-रचना, समास, शब्द-भेद: विकारी और अविकारी, लिंग, वचन, कारक, काल और वाच्य, वाक्य-विचार और शुद्ध लेखन, शब्द-भंडार, रस, छंद, अलंकार और शब्द-शक्ति, हिंदी साहित्य, अपठित बोध, हिंदी शिक्षणशास्त्र
  3. Language II — English: Sounds, Spelling and Word Formation, Parts of Speech, Nouns and Pronouns, Articles, Determiners and Adjectives, Verbs and Modals, Tenses and Subject–Verb Agreement, Adverbs, Prepositions and Conjunctions, Sentence Structure, Voice and Narration, Vocabulary, Sentence Correction and Writing Skills, Poetry and English Literature, Reading Comprehension, Pedagogy of English Language
  4. Language II — Urdu: رسم الخط، املا اور تلفظ, ذخیرۂ الفاظ, قواعد, محاورے اور ضرب الامثال, شعر و سخن, اردو ادب کی تاریخ, تفہیمِ عبارت, اردو کی تدریس
  5. Language II — Sanskrit: वर्णविचारः एवं संज्ञाप्रकरणम्, सन्धिप्रकरणम्, शब्दरूपाणि, धातुरूपाणि, कारकाणि एवं विभक्तयः, उपसर्गाः एवं अव्ययानि, प्रत्ययप्रकरणम्, समासप्रकरणम्, वाच्यप्रकरणम्, संख्याज्ञानम्, शब्दज्ञानम् एवं अनुवादः, अपठितावबोधनम्, संस्कृतसाहित्यम् एवं काव्यशास्त्रम्, संस्कृतशिक्षणशास्त्रम्
  6. Mathematics: संख्या पद्धति एवं स्थानीय मान / Number System & Place Value, मूलभूत संक्रियाएँ, सरलीकरण एवं पैटर्न / Basic Operations, Simplification & Patterns, गुणनखंड, विभाज्यता, म.स.प. एवं ल.स.प. / Factors, Divisibility, HCF & LCM, भिन्न एवं दशमलव / Fractions & Decimals, वर्ग, घन, घातांक एवं करणी / Squares, Cubes, Exponents & Surds, मापन: लंबाई, भार, धारिता, समय एवं मुद्रा / Measurement: Length, Mass, Capacity, Time & Money, बीजगणित / Algebra, अनुपात, समानुपात, औसत एवं आयु / Ratio, Proportion, Average & Ages, प्रतिशत, लाभ-हानि एवं ब्याज / Percentage, Profit–Loss & Interest, समय-कार्य एवं चाल-दूरी / Time & Work and Speed–Distance, रेखाएँ, कोण, आकृतियाँ एवं निर्देशांक / Lines, Angles, Shapes & Coordinates, त्रिभुज, चतुर्भुज, वृत्त एवं त्रिकोणमिति / Triangles, Quadrilaterals, Circles & Trigonometry, क्षेत्रमिति: परिमाप, क्षेत्रफल एवं आयतन / Mensuration: Perimeter, Area & Volume, आँकड़ा प्रबंधन, सांख्यिकी एवं प्रायिकता / Data Handling, Statistics & Probability, गणित शिक्षणशास्त्र / Mathematics Pedagogy
  7. Science: प्रौद्योगिकी, मापन एवं गति / Technology, Measurement and Motion, बल, दाब, कार्य एवं ऊर्जा / Force, Pressure, Work and Energy, ऊष्मा एवं ध्वनि / Heat and Sound, प्रकाश / Light, विद्युत एवं चुंबकत्व / Electricity and Magnetism, ब्रह्मांड एवं प्राकृतिक परिघटनाएँ / Universe and Natural Phenomena, पदार्थ एवं उसकी संरचना / Matter and Its Structure, रासायनिक अभिक्रियाएँ, अम्ल, क्षार एवं लवण / Chemical Reactions, Acids, Bases and Salts, धातु, अधातु एवं दैनिक उपयोग की सामग्री / Metals, Non-metals and Materials of Daily Use, सजीव जगत: वर्गीकरण, कोशिका एवं ऊतक / Living World: Classification, Cell and Tissues, पादपों में पोषण, परिवहन एवं जनन / Plants: Nutrition, Transport and Reproduction, मानव शरीर एवं अंग तंत्र / Human Body and Organ Systems, भोजन, पोषण एवं स्वास्थ्य / Food, Nutrition and Health, पर्यावरण एवं पारिस्थितिकी / Environment and Ecology, पर्यावरण, पारिस्थितिकी और वन्यजीव / Environment, Ecology and Wildlife, प्राकृतिक संसाधन, प्रदूषण और जलवायु परिवर्तन / Natural Resources, Pollution and Climate Change
  8. Social Studies/Social Science: प्राचीन भारत का इतिहास / Ancient Indian History, मध्यकालीन भारत का इतिहास / Medieval Indian History, औपनिवेशिक भारत एवं समाज सुधार / Colonial India and Social Reform, भारतीय राष्ट्रीय आंदोलन एवं स्वतंत्र भारत / Indian National Movement and Independent India, विश्व इतिहास एवं अंतरराष्ट्रीय संबंध / World History and International Relations, पृथ्वी, ग्लोब एवं मानचित्र / Earth, Globe and Maps, भौतिक भूगोल / Physical Geography, प्राकृतिक वनस्पति, वन्य जीवन एवं विश्व के प्रदेश / Natural Vegetation, Wildlife and World Regions, भारत का भूगोल / Geography of India, संसाधन एवं विकास / Resources and Development, सामाजिक एवं राजनीतिक जीवन / Social and Political Life, भारतीय संविधान / Indian Constitution, सरकार: केंद्र, राज्य एवं स्थानीय / Government: Union, State and Local, अर्थशास्त्र एवं भारतीय अर्थव्यवस्था / Economics and Indian Economy, सामाजिक विज्ञान शिक्षणशास्त्र / Social Science Pedagogy, पृथ्वी, आकाश और आपदाएँ / Earth, Sky and Disasters, उत्तर प्रदेश सामान्य ज्ञान / Uttar Pradesh GK
  9. अतिरिक्त अभ्यास / Extra Practice (beyond syllabus): भारतीय अर्थव्यवस्था: आँकड़े एवं समसामयिकी / Indian Economy: Data & Current Affairs, भारतीय कला एवं संस्कृति / Indian Art & Culture, विज्ञान एवं प्रौद्योगिकी / Science & Technology, पर्यावरण एवं जलवायु समसामयिकी / Environment & Climate Affairs, रक्षा एवं सुरक्षा / Defence & Security, स्थिर सामान्य ज्ञान / Static General Knowledge, पुरस्कार एवं सम्मान / Awards & Honours, सरकारी योजनाएँ, शासन एवं आधारभूत संरचना / Government Schemes, Governance & Infrastructure, पासा एवं घन / Dice & Cubes
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This educational video presents a series of divisibility rules for the numbers 28, 29, 30, and 31, taught by an instructor named Yash Jain Sir. The video begins with a title card and a colorful, hand-drawn diagram illustrating various divisibility rules. The main content consists of four distinct slides, each dedicated to a specific number. For 28, the rule is that a number is divisible by 28 if it is divisible by both 4 and 7, with the example of 140 being used. For 29, the rule is to add three times the last digit to the remaining leading truncated number, and if the result is divisible by 29, then so is the original number, demonstrated with the example 15689. For 30, the rule is that a number must be divisible by both 3 and 10, illustrated with the example 270. Finally, for 31, the rule is to subtract three times the last digit from the remaining leading truncated number, with the example 7998 being shown. The video concludes with a 'Thanks for Watching' screen.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The video opens with a title card displaying 'DIVISIBILITY RULES' over a background of scattered numbers. This transitions to a colorful, hand-drawn diagram titled 'DIVISIBILITY RULES' which visually explains rules for numbers 2, 3, 4, 5, 6, 7, 8, 9, 10, and 11. The instructor, Yash Jain Sir, appears in a small window in the bottom right corner. The first main slide is then shown, titled 'Divisibility Rule of 28'. It states that a number is divisible by 28 if it is divisible by 4 and by 7, with the example 140. The instructor begins to explain the rule, and the number 28 is written as 4 x 7 on the slide.

  2. 2:00 – 5:00 02:00-05:00

    The video continues to focus on the 'Divisibility Rule of 28'. The instructor explains that since 28 = 4 x 7, a number must be divisible by both 4 and 7. He demonstrates this with the example 140. He shows that 140 divided by 4 is 35, and 140 divided by 7 is 20. He also writes the multiplication 28 x 5 = 140 to reinforce the concept. The slide remains on screen, and the instructor's voiceover explains the logic behind the rule, emphasizing that if a number is divisible by two co-prime numbers, it is divisible by their product.

  3. 5:00 – 10:00 05:00-10:00

    The video transitions to a new slide titled 'Test for divisibility by 29'. The rule is stated: 'Add three times the last digit to the remaining leading truncated number. If the result is divisible by 29, then so was the first number.' An example is provided: 15689. The instructor demonstrates the process step-by-step: 1568 + 3*9 = 1568 + 27 = 1595. He continues: 159 + 3*5 = 159 + 15 = 174. Then: 17 + 3*4 = 17 + 12 = 29. Since 29 is divisible by 29, the original number 15689 is also divisible by 29. The video then moves to the 'Divisibility Rule of 30', stating it is divisible by 3 and 10, with the example 270. Finally, it presents the 'Test for divisibility by 31', which is to 'Subtract three times the last digit from the remaining leading truncated number.' The example 7998 is used: 799 - 3*8 = 799 - 24 = 775. Then: 77 - 3*5 = 77 - 15 = 62. Since 62 is 2*31, 7998 is divisible by 31.

  4. 10:00 – 10:05 10:00-10:05

    The video concludes with a final screen. The background is a dark purple gradient. In the center, the text 'THANKS FOR WATCHING' is displayed in a large, white, sans-serif font. This is the end of the lecture.

The video provides a clear and structured lesson on advanced divisibility rules. It follows a consistent pattern: introducing a rule for a specific number, explaining the logic (often by breaking the number into its prime factors), and then demonstrating the rule with a detailed, step-by-step example. The use of a hand-drawn diagram at the beginning provides context, while the subsequent slides focus on one rule at a time, ensuring clarity. The progression from 28 to 31 is logical, covering a range of composite numbers and demonstrating different types of rules (multiplication, addition, subtraction). The instructor's methodical approach makes the concepts accessible for students preparing for competitive exams.

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