Teaching children in elementary school is a challenge. But I see that you are a very creative teacher in the use of learning media. Using letters with colors is certainly a good method to be remembered by your students. You already understand the characteristics of your students very well, that children will remember very easily with different colors. Moreover, you asked them to copy back the learning and ask them again to find out the extent of their understanding. That's amazing to me.

Good luck for this contest.