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To determine what common factor Tom can use to evenly group the marbles, we need to find the greatest common factor (GCF) of 9 and 18.

The factors of 9 are:
\[
1, 3, 9
\]

The factors of 18 are:
\[
1, 2, 3, 6, 9, 18
\]

The greatest common factor is the largest number that appears in both lists, which is **9**.

So, Tom can group the marbles into **9** groups.

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Here are 5 related questions:
1. How do you find the greatest common factor of three numbers?
2. Can Tom group the marbles in any other number of equal groups?
3. What would the common

Tom has 9 red marbles and 18 blue marbles. What common factor can he use to evenly group the marbles?

Learn how to find the greatest common factor (GCF) of 9 and 18. This simple problem involves understanding the divisibility of numbers and the greatest common divisor theorem. Suitable for students in Grades 5-6.

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