5 x 9 = 45
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There is no answer to this question within the normal context of "factor" and "paired".
5 is not a factor of 57.
Only 5 is the factor of 45 because 45 is divisible by 5. But 12 is not a factor of 45 because 45 is not divisible by 12.
The GCF of 45 and 80 is 5. Prime factors: 45 = 5x3x3 80 = 5x2x2x2x2 the only prime factor in both is 5, and so the highest common factor is 5. Alternative method: 80 mod 45 = 35 45 mod 35 = 10 35 mod 10 = 5 10 mod 5 = 0 so HCF = 5.
45 and five's highest common factor is five.