Mad Numbers - Adding and Subtracting up to 1000

With these fun quartet games, children automate in a playful way.
Find the opponent who has your missing quartet cards. If you solve the sum correctly, you get the card.
You check the solution with the magic envelope.

Playfully learn to add and subtract up to 1000 better.

With 76 quartet cards, magic envelope, and game rules.

For 1-4 players or teams. Also suitable for independent practice.