Jarrod used square pattern blocks to help him find the greatest 12 and 18 . List all the factors for 12 : List all the factors for 18 . Use the models to find the GCF of

The factors of 12 are 1, 2, 3, 4, 6, and 12. When you break it down, these are the numbers that can be multiplied together in pairs to give you 12. For example, 1 × 12 or 3 × 4—each of these combinations showcases how 12 can be formed. The factors of 18 are 1, 2, 3, 6, 9, and 18. Similar to before, these are the combinations of numbers that multiply together to equal 18. For instance, 2 × 9 and 3 × 6 are good examples of how you can reach 18 using different pairs of factors. To find the GCF, you look for the largest number that appears in both lists, which in this case is 6!