Short Tricks to Remember Ratio to Percentage Table Part 4

Duration: 8 min

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Module outline

  1. About the Course: About the Course
  2. Paper-1 & 2 | Basic Numeracy: Ratio and Proportion (Ratios), Divisibility Rules, Mixture and Alligation, Permutation and Combination, Logarithm, Number System, HCF LCM, Sequence and Series (Series), Speed Time and Distance, Percentage, Average, Mensuration and Geometry, Age Problems, Arithmetic, Statistics, Probability, Profit and Loss, Simple Interest and Compound Interest, Partnership, Speed Mathematics and Basic Mathematics, Algebra, Powers and Exponents (Surds and Indices), Time and Work, Pipe and Cistern, RSSB Specific Videos - Basic Numeracy
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AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This educational video provides a comprehensive guide to converting ratios into percentages, with a strong emphasis on memorization techniques for competitive exams. The instructor, Yash Jain, begins by presenting a detailed table of common ratios and their corresponding percentage values. The lesson progresses from basic fractions like 1/2 and 1/4 to more complex ones like 1/7 and 1/11. A significant portion of the video is dedicated to a specific trick for calculating multiples of 1/7, utilizing a multiplication method to recall the repeating decimal sequence 142857. The visual aids include chalkboard-style graphics, data tables, and handwritten calculations on a digital whiteboard to reinforce the concepts.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The video opens with a title card reading 'PERCENTAGE' followed by an introduction slide 'PERCENTAGES - By YASH JAIN'. The instructor introduces the topic and displays a 'RATIO TO PERCENTAGE TABLE'. This table lists fundamental ratios such as 1/1, 1/2, 1/3, 1/4, 1/5, 1/8, 1/16, and 1/32 alongside their percentage equivalents like 100%, 50%, 33.33%, 25%, 20%, 12.5%, 6.25%, and 3.125%. The instructor likely reviews these standard conversions to establish a baseline for the lesson.

  2. 2:00 – 5:00 02:00-05:00

    The 'RATIO TO PERCENTAGE TABLE' expands to include more complex fractions. The instructor displays values for 1/6 (16.67%), 1/7 (14.2857%), 1/8 (12.50%), 1/9 (11.11%), 1/10 (10%), 1/11 (9.09%), and 1/12 (8.33%). The table continues with ratios like 1/17 (5.88%), 1/18 (5.55%), 1/19 (5.22%), 1/20 (5.00%), and extends to 1/25 through 1/37. The instructor emphasizes memorizing these specific percentage values, such as 1/7 being approximately 14.2857%, to facilitate quick mental math during problem-solving.

  3. 5:00 – 8:14 05:00-08:14

    The lesson focuses specifically on the fraction 1/7 and its multiples. The table shows 1/7 (14.2857%), 2/7 (28.5714%), 3/7 (42.8571%), 4/7 (57.1428%), 5/7 (71.4285%), 6/7 (85.7142%), and 7/7 (100%). The instructor writes multiplication equations on the screen, such as '14 x 1 = 14', '14 x 2 = 28', and '14 x 3 = 42', to demonstrate a trick for finding the first two digits of the percentage. He explains the cyclic pattern of the digits 142857 and categorizes numerators as even or odd to help students remember the sequence. He also notes that knowing tables up to 25 is a prerequisite for this method.

The video systematically builds a student's ability to convert ratios to percentages by first establishing a foundation of common fractions and then introducing advanced memorization tricks. The progression moves from a general reference table covering ratios from 1/1 to 1/37 to a deep dive into the specific properties of the fraction 1/7. By breaking down the repeating decimal 142857 and linking it to simple multiplication tables, the instructor provides a practical tool for rapid calculation. This structured approach ensures that learners not only memorize values but also understand the underlying patterns, making the content highly effective for exam preparation.

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