Co-prime pairs are: Co-prime numbers are two numbers that share no common factors other than 1. Their greatest common divisor (GCD) is 1. Examples include (8, 15) and (21, 22), which have no shared prime factors.
- (18, 35): GCD = 1
- (15, 37): GCD = 1
Non co-prime pairs: - (30, 415): GCD = 5
- (17, 69): GCD = 1
- (81, 18): GCD = 9
class 6 Mathematics Textbook Chapter 5 question answer
class 6 Mathematics Chapter 5 Prime Time solutions
Using prime factorizations:
• (18, 35): Factors are 2,3 and 5,7; GCD = 1, co-prime.
• (15, 37): Factors are 3,5 and 37; GCD = 1, co-prime.
• (30, 415): Factors are 2,3,5 and 5, 83; GCD = 5, not co-prime.
• (17, 69): Factors are 17 and 3, 23; GCD = 1, co-prime.
• (81, 18): Factors are 3⁴ and 2,3²; GCD = 9, not co-prime.
Not co-prime numbers are two numbers that share common factors other than 1. Their greatest common divisor (GCD) is greater than 1. Examples include (8, 12) and (14, 28), sharing factors like 2 or 7.
For more NCERT Solutions for Class 6 Math Chapter 5 Prime Time Extra Questions and Answer:
https://www.tiwariacademy.com/ncert-solutions-class-6-maths-ganita-prakash-chapter-5/