Very simple webpage that displays random numbers that appear with nice animations.
I used this when I taught ESL in elementary school. The timing of the animations, the graphics, and the colors were all chosen to make it easy to see from the back of the classroom.
You can adjust the range of numbers to practice in the code. The default code shows how you can do a set range, order individual numbers, and do random number ranges without repeats. Mix and match as desired.
Feel free to use this on any browser as I believe it worked on browsers as old as IE6.