Methods aren't necessary. The only common factor (which makes it the GCF) of 16 and 35 is 1.
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To answer GCF and LCM questions.
They do not necessarily use them every day.
It doesn't matter what method you use, you need at least two numbers to find a GCF.
Prime numbers help you to find the LCM and the GCF.
2 x 3 = 6 2 x 5 = 10 The GCF is 2.