Answer:
The GCF is 28
Step-by-step explanation:
<u>Step 1:  Find the factors of both numbers</u>
84 → 1,  2
,  3
,  4
,  6
,  7
,  12
,  14
,  21
,  28
,  42
,  84
56 → 1
,  2
,  4
,  7
,  8
,  14
,  28
,  56
The factor that is the biggest common in both is the GCF.  We see that 28 is the biggest factor that matches for both numbers.
Answer:  The GCF is 28