Here is a manipulative that you can cut out and use with your students or children. I like to use rhythm solfege as outlined in the video to demonstrate counting, but you can also simply count to 4. This is just one hands-on approach that you can add to your toolbox. I colored the squares simply because children like color. I included a black and white version too, which will be cheaper to print. You can always color them with crayons if you want. I recommend printing them on card-stock, and laminating, if desired.
It may be tricky on the print-out to see where the cutting lines are, hopefully this illustration can help. Enjoy!