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140=2*2*5*7
300=2*2*3*5*5
comon factrs are 2*2*5=20 20 is the gcf
The GCF is 20.
The GCF is 10.
The GCF is 4.
The GCF of 140 and 490 is 70.
GCF of 140 and 25 is 5.
The GCF is 28.
The GCF is 35.
The GCF is 2.
The GCF is 1.