Basics of Number System Part-1
Duration: 9 min
This video lesson is available to enrolled students.
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This educational video provides a foundational overview of number systems, beginning with the core concept that the main idea is counting and representing quantity. The instructor starts by explaining 'Unary counting,' the most primitive method used in the Stone Age and even today, which relies on fingers and tools like the abacus. He illustrates the limitations of this system when dealing with large quantities, such as in business or research, using a vivid example of a truck dumping coins. The lecture then transitions to the decimal system (Base 10), explaining its prevalence due to human anatomy (10 fingers) and its historical use across various cultures like Indian, British, and Roman. The instructor demonstrates the place value concept using the number 723. Finally, the video touches upon the historical contributions of the Indian mathematician Aryabhata and concludes with a structured classification of number systems into those used in real life versus those used in computer science, specifically Binary, Octal, and Hexadecimal.
Chapters
0:00 – 2:00 00:00-02:00
The session opens with a slide titled 'Basics,' stating that the 'Main idea in number system is counting and representation of quantity.' The instructor introduces the concept of 'Unary counting,' noting it was used in the Stone Age and is still the basic idea today. He prompts the audience to remember how they started counting on fingers and using an abacus. Visual aids include a photo of a young boy counting on his fingers and another of a child holding an abacus. The instructor poses a critical question: 'How can we use it for counting sheep or anything?' This sets the stage for understanding why more complex systems are needed beyond simple one-to-one correspondence. The visual focus remains on these primitive counting methods to establish a baseline for the student.
2:00 – 5:00 02:00-05:00
The instructor explains that for larger quantities in day-to-day life, business, or research, the unary system is impractical. To demonstrate this, he displays an image of a dump truck unloading a massive pile of coins, with the caption 'Samsung pays Apple $1 Billion sending 30 trucks full of 5 cent coins.' This visual emphasizes the absurdity of counting individual coins for large sums. He then introduces the 'decimal system' as the next popular system used in real life. He attributes this to having '10 fingers on over hands' and notes that different cultures, including Indian, British, Roman, and Arabic, have used base 10 for general purpose counting. On the whiteboard, he writes the number '723' and breaks it down mathematically as $7 imes 10^2 + 2 imes 10^1 + 3 imes 10^0$, which equals $700 + 20 + 3 = 723$. This serves as a concrete example of place value in the decimal system.
5:00 – 8:54 05:00-08:54
The lecture shifts to the history of mathematics, specifically highlighting the Indian contribution. The slide states, 'Thought Aryabhata (3500 years back) was the first one known to extensively worked on the idea of zero, pie, number system, trigonometry, quadratic equations, astronomy etc.' The instructor mentions that in Indian culture, complex math was worked on from early times, and Aryabhata was likely the first to properly write and publish his understanding. Images of Aryabhata are shown. The video concludes with a flowchart diagram classifying 'Number System' into two main branches: 'Real life' and 'Computer Science.' Under 'Real life,' it lists 'Unary (Base 1)' and 'Decimal (Base 10).' Under 'Computer Science,' it lists 'Binary (Base 2),' 'Octal (Base 8),' and 'Hexadecimal (Base 16).' The instructor points to these boxes to categorize the systems discussed.
The video effectively guides the student from the primitive origins of counting to the structured classification of modern number systems. It establishes that while unary counting is the foundation, it is insufficient for large-scale operations, necessitating the decimal system which is deeply rooted in human anatomy and history. The inclusion of Aryabhata provides cultural context for the development of these mathematical concepts. Finally, the flowchart synthesizes this knowledge by distinguishing between systems used in daily life and those essential for computer science, providing a clear roadmap for further study in number systems.