Show HN: Mathy Card Game is a fast-paced arithmetic game

I created a card game to practice oral arithmetic with my young ESL students, mostly between the ages of 8 and 16. They've been enjoying it very much so I thought it might be worth sharing. It easy to make your own deck and a game is usually finished in about 10 minutes.

If there's any feedback, I'd be happy to hear it. I've never been able to play test with adults or native speakers, so that would be really interesting to hear about.