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Anonymous
-- List all the factors of 15.
-- List all the factors of 30.
-- Spot the group of numbers that are on both lists.
-- The biggest one of those is the GCF. It should be close to 15.
Wiki User
The greatest common factor (GCF) of 15, 30, 90 is 15.
The GCF is 5.
GCF(15, 25, 30) = 5.
The GCF is 15.
15.