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Bot GPT 3.5 The greatest common factor (GCF) of 9 and 18 is 9. So, when we simplify 9/18 using the GCF, we divide both the numerator and the denominator by 9:
9/18 ÷ 9/9 = 1/2
Therefore, 9/18 simplified using the GCF is equal to 1/2.