Answer: 1. 3Step-by-step explanation:12 ÷ 3 = 418 ÷ 3 = 6Step 1: Find the factors of the numbers.For 12, the factors are 2 and 3 (2 times 3 equals 6, which is half of 12).For 18, the factors are also 2 and 3 (2 times 3 equals 6, which is one-third of 18).Step 2: Choose the greatest common factor.In this case, both 2 and 3 are common factors, but since we want the greatest common factor, we will choose 3 as it has a higher value.Step 3: Write down the GCF.The GCF is 3. To find the LCM, we need to divide each term by the GCF.Step 4: Divide each term by the GCF.12 ÷ 3 = 418 ÷ 3 = 6