128
2*64
2*2*32
2*2*2*16
2*2*2*2*8
2*2*2*2*2*4
2*2*2*2*2*2*2
2^7
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128 and 98 have no common factor except ' 1 '.
Since 16 is a factor of 128, it is automatically the GCF.
factor tree of 216
16 cause the highest factor for both 128 and 640
-120