What is how to fix cracked jersey numbers?

As an AI language model, I don't have the practical experience to fix cracked jersey numbers. However, below are some ways that might help to fix cracked jersey numbers:

1. If the crack is minor, use a fabric adhesive to glue the crack together.

2. If the crack is severe, it's best to replace the number altogether. You can purchase replacement numbers from sporting goods stores or online retailers.

3. If the jersey number is embroidered, you may need to carefully unpick the embroidery so that you can replace the damaged portion with a new one.

4. If you don't have the skills required to fix jersey numbers, take your jersey to a professional tailor or sporting goods store and get it fixed by them.

5. It's best to avoid washing your jersey with other clothing items as the friction can cause the numbers to crack. Always wash your jersey separately.

6. Try to avoid using bleach or harsh chemicals as they can damage the color and fabric of the jersey numbers and cause them to crack over time.

7. To prevent jersey numbers from cracking, always store your jersey in a cool and dry place. Store them folded instead of hanging to reduce the risk of cracking.