You can count 12 using the joints of four fingers on one hand. This method directly forms the basis of ancient base-12 counting systems, utilizing the thumb as a natural pointer.
Ancient Indians used the joints of their fingers to count, a practice still seen today. Each finger has 3 joints, and the thumb is used to count them. How many can you count on one hand? How does this relate to the ancient base-12 counting systems?
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Each of the four fingers has three distinct joints, allowing you to count up to 12 on a single hand by using your thumb as a pointer to touch each joint. This practical method is the foundation of ancient base-12 counting systems, known as duodecimal systems. It explains why historical cultures settled on twelve as a primary mathematical grouping, which influenced modern measurements like twelve inches in a foot and twelve hours on a clock face.
For more NCERT Solutions for Class 9 Maths Ganita Manjari Chapter 3 The world of numbers (2026-27):
https://www.tiwariacademy.com/ncert-solutions/class-9/maths/ganita-manjari-chapter-3/