Answer :

[tex]10|2 \\ 5|5 \\ 1 \\\\ 10=2*5 \\\\ the \ number \ 2 \ is \ factor \ of \ 10 \ but \ not \ multiple \ of \ 5[/tex]
Factors of 10: 1, 10, 2, 5

Multiples of 5: 5, 10, 15, etc.

From this, we see that 5 and 10 are factors of 10 and multiples of 5. Therefore, there are two numbers that are factors of 10 but not 5. 

They are: 1 and 2

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