Mr. Lindsay Certified Square Root T-Shirt

If Train A is traveling at 36 mph and Train B is traveling at 49 mph… how many times can a student say their favorite number before the teacher loses it?

About sixseveeennn

This t-shirt takes Gen Alpha’s obsession to the next level with a subtle math twist: the square root of 36 and the square root of 49 — essentially giving us the iconic "6 7". It’s the best way for kids to flex their favorite number and get a tiny brain gain.

Complete with Mr. Lindsay’s certified logo on the back, it’s perfect for kids who can’t stop chanting, and teachers or parents who want to join in.  Hey, if you can’t stop it… rock it!

Features:

• Solid colors: 100% ring-spun cotton for everyday comfort. Heather blends: 35%/65% ring-spun cotton and polyester. Sport Grey & Antique: 90%/10%
• Unisex fit for everyday wear
• Tear-away label for comfort, twill tape for durability
• Tumble dry: low heat. Iron: low heat; Machine wash: cold (max 90F), with similar colors. Do not dryclean. Do not bleach.

Why You’ll Love It

• Kids can wear the numbers that are low-key everywhere rn. 
• Teachers and Parents can embrace the chaos with style and clever math
  
• It's Certified Cool — Mr. Lindsay said this one slaps!

Join the biggest middle school trend of 2025 and add in some nerdy math vibes! Grab your Mr. Lindsay Certified Square Root T-Shirt today!  Turn a viral number into a moment of connection and show you’re in on the fun.