9 = 3 x 3
16 = 4 x 4
25 = 5 x 5
36 = 6 x 6
49 = 7 x 7
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No, the GCF of an odd an even number is not always 1. Odd and even numbers can share factors other than 1. For example, the greatest common factor of 5 and 10 is 5.
1 + 2 + 4 + 5 + 10 + 20 + 25 + 50 + 100 = 217
No. Any number where 5 is a factor will end in 5 or 0
The factors of 20 are 1, 2, 4, 5, 10, and 20
1 is a factor of 5 which is a prime number