This math worksheet focuses on developing children's skills in number theory by asking them to list all the factors of given numbers. Knowing the difference between prime and composite numbers allows students to break numbers down into their basic building blocks, which is essential for understanding factors, multiples, and more complex math topics such as fractions, divisibility rules, and algebra. For example, to find all the factors of 39, start by dividing 39 by each whole number starting from 1 to the square root of 39. This would be a great way to introduce the usefulness of square roots! For each number that divides evenly into 39, both that number and the result of dividing 39 by that number are factors.