Find the Greatest Common Factor of 280 and 144.
we will do prime factorisation,
280 =Â $$2\times\ 2\times\ 2\times5\times\ 7$$
144 =Â $$2\times\ 2\times\ 2\times2\times\ 3\times\ 3$$
Hence, GCF =Â $$2\times\ 2\times\ 2=8$$
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