Which of the following numbers are co-prime?
(a) 18 and 35
Factors of 18 are 1, 2, 3, 6, 9 and 18.
Factors of 35 are 1, 5, 7 and 35.
Therefore, 1 is the only common factor of 18 and 35. It means that 18 and 35 are co-prime.
(b) 15 and 37
Factors of 15 are 1, 3, 5 and 15.
Factors of 37 are 1 and 37.
Therefore, 1 is the only common factor of 15 and 37 which means that 15 and 37 are co-prime.
(c) 30 and 415
30 and 415 are not co-prime because 1 is not the only common factor of these numbers. Example, 5 is another common factor of 30 and 415.
(d) 17 and 68
17 and 68 are not co-prime because 1 is not the only common factor of these numbers. Example, 17 is another common factor of 17 and 68.
(e) 216 and 215
215 and 216 are co-prime because 1 is the only common factor of these numbers.
(f) 81 and 16
Factors of 16 are 1, 2, 4, 8 and 16.
Factors of 81 are 1, 3, 9, 27 and 81.
Therefore, 1 is the only common factor of 81 and 16 which means that 81 and 16 are co-prime.
Naman says
5 and 25 are co-prime no. yes or no
Jashan says
no
Moksha Patel says
No
Maninder says
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Biswaraj Sahoo says
No
Jayosmi says
Are 35 and 16 co prime numbers?
Jashan says
Yes, they are co-prime numbers because their only common factor is 1.
Subhashree dandapat says
Yes there only 1 common factor and that is 1
Harshita Sahu says
35=1,5,7,35
16=1,2,4,8,16
1 is only common factor of 35 and 16 that mean 35 and 16 are co-prim number
Subarna Acharjee says
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mehlam says
30 and 415 are not co-prime because they have 1 and 5 as common factors. Since there are more than 1 common factor hence these two numbers are not co prime.
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J sandhu says
Are 100 and 32 co prime no or not
Please tell
Fatima says
Ù
Priti kumari says
411 and 273 are co-prime no yes or no
Jashan says
No, they are not co-prime numbers. Both of these numbers are divisible by 3.
Satish says
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