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Sale Price $1.69.
Original Price $1.87 Comp. value
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Retro Funny 9th Birthday Math Nerd Gift for Kids Postcard
Qty:
Paper Type
Signature Matte
18 pt thickness / 120 lb weight
Soft white, soft eggshell texture
-$0.17
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About This Design
Retro Funny 9th Birthday Math Nerd Gift for Kids Postcard
Celebrate a smart and fun birthday milestone with this clever “√81 Years Old” math birthday design. Since the square root of 81 equals 9, this design is perfect for someone turning 9 years old who loves numbers, math, science, puzzles, learning, school, or nerdy birthday humor.
Featuring a chalkboard-inspired background filled with equations, graphs, geometry, formulas, and classroom-style details, this design makes a fun and memorable gift for 9th birthdays, math-loving kids, STEM students, future engineers, young science fans, homeschool students, classroom celebrations, and birthday party gifts.
This design works beautifully across Zazzle products including t-shirts, hoodies, sweatshirts, mugs, birthday cards, invitations, stickers, posters, tote bags, keychains, magnets, buttons, phone cases, party favor tags, and birthday party decorations. A great choice for birthday boys, birthday girls, students, kids who love math, and families planning a clever educational birthday theme.
Customer Reviews
4.8 out of 5 stars rating2.4K Total Reviews
2,369 Reviews
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5.0 out of 5 stars rating
5 out of 5 stars ratingBy Suzi G.September 17, 2025 • Verified Purchase
Post Card, Size: Standard Postcard, Paper: Signature Matte, Envelopes: None
This tropical card is so good 1🙂🙂The colors, borders, text fonts, all added up to 💯% satisfied customer!!!! 👍.
5.0 out of 5 stars rating
5 out of 5 stars ratingBy Michelle H.July 15, 2025 • Verified Purchase
I got these to go with the matching invitations and used them as RSVP postcards. Everyone loves them! The feedback was they are the neatest design the invitees have seen! Just a word of caution these default to matte so if you are wanting gloss you have to change it manually. Thanks Cathy for providing the best product for our occasion! I am super impressed! .
5.0 out of 5 stars rating
5 out of 5 stars ratingBy Linda T.September 22, 2021 • Verified Purchase
Post Card, Size: Standard Postcard, Paper: Signature Matte, Envelopes: None
Zazzle Reviewer Program
Positive; clearly high qualitywork; attention to detail. Exceeded expectations; fun, colorful too clever
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Product ID: 256284653472628989
Created on: 9/10/2021, 4:52 PM
Rating: G