90 and 75's highest common factor is 15.
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The greatest common factor is 15.
The greatest common factor of the numbers 45, 75 and 90 is 15.
The greatest common factor of 75, 90, and 40 is 5. GCF = 5 Factors of 40: 1, 2, 4, 𝟱, 8, 10, 20, 40 Factors of 75: 1, 3, 𝟱, 15, 25, 75 Factors of 95: 1, 𝟱, 19, 95
There cannot be a greatest common factor (GCF) of just one number. To be common there need to be at least two numbers. If you find all the factors of two or more numbers, and you find some factors are the same ("common"), then the largest of those common factors is the Greatest Common Factor.
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