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Online Quiz (Worksheet A B C D)

Questions Per Quiz = 2 4 6 8 10

Grade 8 - Mathematics
5.10 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: 7 and 9 are co-prime numbers, is this statement true or false.
True
False

Q 2: 19 and 29 are co-prime numbers, is this statement true or false.
False
True

Q 3: 29 and 79 are co-prime numbers, is this statement true or false.
True
False

Q 4: 15 and 17 are co-prime numbers, is this statement true or false.
True
False

Q 5: 22 and 32 are co-prime numbers, is this statement true or false.
True
False

Q 6: 8 and 15 are co-prime numbers, is this statement true or false.
False
True

Q 7: 27 and 30 are co-prime numbers, is this statement true or false.
False
True

Q 8: 25 and 35 are co-prime numbers, is this statement true or false.
True
False

Question 9: This question is available to subscribers only!

Question 10: This question is available to subscribers only!


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