Made these counters to have positive numbers and negative on the back, these will help keep your numbers in check at game night when things start to get wild. These may work for more than just Magic the Gathering.

The counters are all 17mm wide and designed to be low profile so you can stack a bunch in to this file here with the organizer https://www.printables.com/model/562460-magic-the-gathering-counters-ultimate-set-storage-/files.

These also are great for Math with kids.