It is a simple and economical method to repair the damaged magnetic blackboard sticker with adhesive tape. Make sure that the broken parts are aligned, and then stick them together with strong enough tape. This can temporarily repair the blackboard sticker so that it can continue to be used. The durability of adhesive tape repair is not as good as the original magnetic connection, so be careful when using it to avoid breaking again. If the blackboard sticker is seriously broken, tape repair can't effectively solve the problem. You can consider buying magnetic blackboard stickers of the same size online instead. This can ensure the integrity and stability of the blackboard sticker and make it work normally. If you don't want to continue to use magnetic blackboard stickers, you can also change to ordinary blackboard stickers. Ordinary blackboard stickers can also be used for writing and wiping, but they cannot be adsorbed on magnetic surfaces like magnetic blackboard stickers. You can choose this alternative method according to your personal needs and preferences.