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Sale Price CA$22.27.  
Original Price CA$26.20 per mug
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Funny Math Pun Be Rational Imaginary Number Teache Coffee Mug

4.8 out of 5 stars rating
22790 Total Reviews |
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Classic Mug
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Style: Classic Mug

Give a made-to-order mug from Zazzle to someone special, or treat yourself to a design that brings you joy or makes you laugh. Create your own photo mug, shop our collection of the funniest joke mugs, personalize your mug with a monogram, or express yourself with one of our 10 million designs.

  • Available in 11-ounce or 15-ounce
  • Dimensions:
    • 11-ounce: 3.2” D x 3.8” H
    • 15-ounce: 3.4” D x 4.5” H
  • Microwave and dishwasher safe
  • Use caution when removing the mug from the microwave. Use a pot holder or glove as necessary if it is too hot to the touch. Do not microwave an empty mug
  • Strong, ceramic construction
  • Meets FDA requirements for food and beverage safety
  • Printed on demand in Reno, NV
  • Do not overfill and be careful with hot liquids that may scald
  • Keep out of reach of children when filled with hot liquid

About This Design

Funny Math Pun Be Rational Imaginary Number Teache Coffee Mug

Funny Math Pun Be Rational Imaginary Number Teache Coffee Mug

Add some humor to your morning routine with this hilarious math pun coffee mug! The design features the imaginary number "$i$" shouting "Be Rational!"—a classic joke perfect for anyone who speaks the language of algebra and geometry. Whether you are looking for a gift for a math teacher, a professor, an engineering student, or just a science nerd who loves a good dad joke, this mug is the perfect solution. Great for Pi Day (3.14), Teacher Appreciation Week, or graduation gifts.
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Artwork designed by
Kolkata, West Bengal, India
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Customer Reviews

4.8 out of 5 stars rating22.8K Total Reviews
20076 total 5-star reviews1916 total 4-star reviews349 total 3-star reviews164 total 2-star reviews285 total 1-star reviews
22,790 Reviews
Reviews for similar products
5.0 out of 5 stars rating
5 out of 5 stars rating
By Jesmina B.January 7, 2024 • Verified Purchase
Classic Mug, 325 ml
Zazzle Reviewer Program
My order was on time, and looked exactly how it appeared on the order site. Printing is gorgeous and so far lasting really well.
5.0 out of 5 stars rating
5 out of 5 stars rating
By D.August 16, 2022 • Verified Purchase
Classic Mug, 325 ml
Zazzle Reviewer Program
Replacement mug arrived today and in record time!! (The original one was damaged in shipping) The mug is in perfect condition. Thanks to Zazzle for excellent customer service. Derek. The printing is beautiful. A nicely inspired design.
5.0 out of 5 stars rating
5 out of 5 stars rating
By Kristie N.December 15, 2020 • Verified Purchase
Classic Mug, 444 ml
Zazzle Reviewer Program
I bought these mugs to give to my clients and people connected to my business and they have had great success. Very happy with the outcome, the service, and the product. Printing turned out great, colours with vibrant and product looks clear and professional. Happy with the results.

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mathfunnyhumorpunjokemathematicsalgebracalculusgeometryteacher
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mathfunnyhumorpunjokemathematicsalgebracalculusgeometryteacher

Other Info

Product ID: 256262616637482583
Designed on 2026-01-15, 10:12 PM
Rating: G