It is not possible to give a sensible answer to this question. The greatest common factor (GCF) refers to a factor that is COMMON to two or more numbers. You have only one number in the question - which is 44+40 = 84.
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You need at least two numbers to find a GCF. If that's 44 and 40, the GCF is 4.
The GCF is 4.
The GCF is 4.
The GCF is 44.
Since 44 is a multiple of 4, the GCF is 4.