The listed numbers are all prime numbers, meaning they have no factors other than 1 and themselves. Following this mathematical pattern, the next three consecutive prime numbers are 23, 29, and 31.
Look at the sequence of numbers on one column of the Ishango bone: 11, 13, 17, 19. What do these numbers have in common? List the next three numbers that fit this pattern.
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The numbers 11, 13, 17, and 19 found on the historic Ishango bone all share a specific mathematical property, they are prime numbers. Prime numbers are natural numbers greater than 1 that cannot be formed by multiplying two smaller natural numbers. They only have two distinct factors, 1 and the number itself. Continuing this sequential prime number pattern directly after 19, the next three consecutive prime numbers are 23, 29, and 31.
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/