Here's a video of Sal working on a exercise which helps you visualize the process of finding a number's factors.
Divisibility intuition is a free educational video by Khan Academy.It helps students in grades 4 practice the following standards 4.OA.B.4.
1. 4.OA.B.4 : Find all factor pairs for a whole number in the range 1-100. Recognize that a whole number is a multiple of each of its factors. Determine whether a given whole number in the range 1-100 is a multiple of a given one-digit number. Determine whether a given whole number in the range 1-100 is prime or composite..
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