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Well, let's see . . .

The factors of 25 are: 1, 5, and 25.

The factors of 90 are: 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, and 90

The factors of 45 are: 1, 3, 5, 9, 15, and 45.

The factors of 100 are: 1, 2, 4, 5, 10, 20, 25, 50, and 100.

The highest factor that's common to all of them is '5'.

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Wiki User

15y ago

What else can I help you with?