1,5,25
1,2,4,5,8,10,20,40
1,3,5,9,15,45
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The factors of 25 are: 1, 5, and 25.The only prime factor of 25 is: 5.The factors of 45 are: 1, 3, 5, 9, 15, and 45.The prime factors of 45 are: 3 and 5.
The common factors of 25 and 40 are 1 and 5. They are 1 and 5.
30, 35, 40, 45
The GCF of 20, 40, and 45 is: 5 because 5*5=25. 5*8=40. 5*9=45. 5 is divisible if the number ends with a 0 or 5.
Factors of 20: 1, 2, 4, 5, 10, 20 Factors of 25: 1, 5, 25 Factors of 40: 1, 2, 4, 5, 8, 10, 20, 40 GCF (20, 25, 40) = 5