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### Grade 8 - Mathematics5.10 Relatively Prime Numbers

 If two numbers do not have any common factors other than 1 they are called relatively prime numbers or co-primes and their G.C.D. is 1. Points: 1. The G.C.D. of two relatively prime numbers is 1 and their L.C.M. is the product of those numbers. 2. Any two prime numbers are always relatively prime each other. 3. Two relatively prime numbers need not be prime numbers. Example: Check 7,8 are relatively prime numbers or not. Solution: The set of factors of 7 is {1,7} The set of factors of 8 is {1,2,4,8} The common factors of 7 and 8 are {1} Therefore, 7 and 8 are relatively prime numbers. Because they don't any any common numbers other than 1. Directions: Check the given number are co-primes or not. Also write at least five examples of your own.
 Q 1: 29 and 79 are co-prime numbers, is this statement true or false.FalseTrue Q 2: 27 and 30 are co-prime numbers, is this statement true or false.TrueFalse Q 3: 25 and 35 are co-prime numbers, is this statement true or false.FalseTrue Q 4: 7 and 9 are co-prime numbers, is this statement true or false.TrueFalse Q 5: 96 and 99 are co-prime numbers, is this statement true or false.FalseTrue Q 6: 19 and 29 are co-prime numbers, is this statement true or false.TrueFalse Q 7: 8 and 15 are co-prime numbers, is this statement true or false.FalseTrue Q 8: 25 and 35 are co-prime numbers, is this statement true or false.FalseTrue Question 9: This question is available to subscribers only! Question 10: This question is available to subscribers only!

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