Interesting factoid: “Arabic numerals were actually from India. Muslim invaders adopted them and the world calls them “arabic”. Let me look:
The origin of the numeral system commonly known as “Arabic numerals” lies in ancient India, where mathematicians developed the decimal place-value system, including the revolutionary concept of zero, as early as the 6th century CE.
This system, known as the Hindu-Arabic numeral system, was devised by Indian scholars seeking a more efficient method for representing numbers and performing calculations.
The numerals were transmitted westward through trade and scholarly exchange, reaching Persia and then the Arab world, where they were adopted, refined, and further disseminated by scholars such as al-Khwarizmi and al-Kindi during the 8th and 9th centuries.
Although the system became known as “Arabic numerals” in Europe due to its transmission through Arabic texts and scholars, its true origin is Indian, and Arab mathematicians themselves refer to these numerals as “Indian numerals”.
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Although I cannot locate the video I shared with my students about the angle theory associated with the shape of Hindu-Arabic numerals, I found this one that is similar:
Were Numbers Created from Angles? A Geometric Perspective
https://www.youtube.com/shorts/Mf1TRgWfMPc
Description:
Were numbers really created from angles? One fascinating theory suggests that early numerals were designed based on the number of angles in their shape!
This idea proposes that each digit from 1 to 9 was originally formed using a specific number of sharp angles, offering a geometric explanation for numeral design. But is there any truth to this? 🤔
In this video, we explore the ‘Angles Theory’ of Numbers and how each digit might have been shaped based on angles alone.
📜 What you’ll learn in this video:
✅ How each number was supposedly formed from angles 🔺
✅ A visual breakdown of numbers 1 to 9 based on their angles 🎨
✅ Why some believe this theory explains numeral design 🧩
✅ A unique way to view numbers through a geometric lens 📏
While this theory presents an interesting perspective, it’s important to note that the numerals we use today—0 to 9—come from the Hindu-Arabic numeral system, which originated in India and was later refined by Arabic scholars before spreading worldwide. However, the ‘Angles Theory’ remains a fun and creative way to rethink how numbers might have been designed!
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The link below is to a video that I did share with my students:
A brief history of numerical systems
https://www.youtube.com/watch?v=cZH0YnFpjwU&list=PLQXuPlXuE4EAZO7XNFMrqz1k5D8FR3JvD