Funny 9th Birthday T-Shirt for Math Lovers

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This black t-shirt is the perfect gift for anyone turning nine years old! It features the square root of 81, accompanied by the phrase "years old" in a stylish script. The design is printed in crisp white, offering a bold contrast against the dark background. Made from a comfortable material, this tee is ideal for everyday wear. Its playful math-themed design makes it a unique conversation starter and a fun way to celebrate a 9th birthday. Great for school, parties, or just hanging out, this shirt combines comfort, style, and a dash of geeky charm! A must-have for young math enthusiasts and anyone with a great sense of humor.

Tags:

#birthday shirt #math shirt #9 years old #square root #geeky tee #black t-shirt #gift for kids #funny shirt #birthday gift #age tee
$35.99 $9.99

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Available Styles:

Variant 1 of Funny 9th Birthday T-Shirt for Math Lovers
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FAQ

Size Guide

Our tees fit true-to-size. Check the size chart before ordering to ensure a perfect fit.

Shipping Time

Processing 2–3 business days; standard delivery 5–12 business days depending on destination.

Care Instructions

Machine wash cold with like colors. Do not bleach. Tumble dry low. Iron inside-out if needed.