Are you looking for a ready made CCSS "I can" statements in student friendly language? This is exactly what you're looking for. Each math standard is broken down into a student friendly, "I can" statement ready to print and hang with the standard written. I would recommend printing on cardstock and laminating for repeated use, but it will print and look just as nice on plain paper in black and white.
If you like this resource, then you'll enjoy my ELA CCSS "I can" statements as well.
⭐ 3rd Grade ELA CCSS "I Can" Statements