Here is an interesting video about partitioning a rectangle into rows.  Remember you have to make the rows and columns equal!

https://learnzillion.com/lessons/3091-partition-rectangles-into-same-sized-squares-by-creating-columns-and-rows 

Stretch those minds – let’s think about what we know about rectangles, arrays, and area!  Remember to look at your rows and columns and add up all of your squares – this will help you get ready for some MULTIPLICATION – what!? ALREADY?! 🙂

https://learnzillion.com/lessonsets/581-relate-area-to-multiplication-and-addition-using-unit-squares-and-arrays