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Retro Funny 8th Birthday Math Nerd Gift for Kids Postcard

4.8 out of 5 stars rating
2371 Total Reviews |
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Paper Type
Signature Matte
18 pt thickness / 120 lb weight Soft white, soft eggshell texture
-$0.17
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Size: Standard Postcard

Create your own vacation-worthy postcard! Any view you’ve seen, any monument you’ve fallen in love with, can all be added to your postcard with our personalization tool.

  • Dimensions: 5.6" L x 4.25" H; qualified USPS postcard size
  • High quality, full-color, full-bleed printing on both sides

Paper Type: Signature Matte

Our Signature Matte paper is a customer favorite—smooth to the touch with a soft eggshell texture that elevates any design. Its sturdy 18 pt weight and natural feel make it the ideal choice for timeless, sophisticated events.

  • Exclusively made for Zazzle
  • Made and Printed in the USA
  • FSC® Certified—sourced from responsibly managed forests that protect both people and planet

About This Design

Retro Funny 8th Birthday Math Nerd Gift for Kids Postcard

Retro Funny 8th Birthday Math Nerd Gift for Kids Postcard

Celebrate a smart and fun birthday milestone with this clever “√64 Years Old” math birthday design. Since the square root of 64 equals 8, this design is perfect for someone turning 8 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 8th birthdays, math-loving kids, STEM students, young science fans, future engineers, 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 decorations. A great choice for birthday boys, birthday girls, students, kids who love math, and families planning a clever educational birthday theme.
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Customer Reviews

4.8 out of 5 stars rating2.4K Total Reviews
2096 total 5-star reviews203 total 4-star reviews28 total 3-star reviews17 total 2-star reviews27 total 1-star reviews
2,371 Reviews
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5.0 out of 5 stars rating
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By 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 rating
By 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 rating
By 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

Tags

Postcards
birthday giftfunny giftbirthday16th birthday20th birthday21st birthday30th birthday40th birthday50th birthday60th birthday
All Products
birthday giftfunny giftbirthday16th birthday20th birthday21st birthday30th birthday40th birthday50th birthday60th birthday

Other Info

Product ID: 256494893812936140
Created on: 9/10/2021, 4:22 PM
Rating: G