 Above, a 1934 plaque from the Big Apple Night Club at West 135th Street and Seventh Avenue in Harlem. Discarded as trash in 2006.

Entry from August 07, 2019
“Mathematics is made of 50 percent formulas, 50 percent proofs and 50 percent imagination”

"Mathematics is made of 50 percent formulas, 50 percent proofs and 50 percent imagination” is a math joke—the percentages add up to 150 percent, not 100 percent. The joke was printed in Pi in the Sky (June 2001) by The Pacific Institute for the Mathematical Sciences (Alberta, Canada).

Authorship of the joke is unknown.

The Pacific Institute for the Mathematical Sciences (Alberta, Canada)
June 2001
Pi in the Sky
Pg. 14, col. 2:
Mathematics is made of 50 percent formulas, 50 percent proofs and 50 percent imagination.

Dimensions of Fractal like sets question.
7/8/02
(...)
Mathematics is made of 50 percent formulas, 50 percent proofs and 50 percent imagination.

The Non-Aggression Axiom of Libertarianism
TommCatt
2/20/03
(...)
Mathematics is made of 50 percent formulas, 50 percent proofs and 50 percent imagination.

Ascend Education
@AscendEducation
“Mathematics is made of 50 percent formulas, 50 percent proofs, and 50 percent imagination.”
9:32 AM · May 5, 2009·Twitter Web Client

Top 100
SATURDAY, JULY 11, 2009
Top 10’s Funny Mathematics Quotes
(...)
“Mathematics is made of 50 percent formulas, 50 percent proofs, and 50 percent imagination.”

School of Mathematics
@MathsBirmingham
#Mathematics is made of 50 percent formulas, 50 percent proofs, and 50 percent #imagination. #mathsbirmingham #quotes
Image
1:41 PM · Dec 20, 2012 from Birmingham, England·Tweetbot for iOS

Olympiad EHF Math Activity Book Class 7
Edited by Dr. Sandeep Ahlawat
Delhi, India: EHF Learning Media Pvt Ltd.
2014
Pg. 25:
Mathematics is made of 50 percent formulas, 50 percent proofs, and 50 percent imagination.

Quora
Is this true: “Mathematics is made of 50 percent formulas, 50 percent proofs, and 50 percent imagination”?
Kurt Behnke, PHD Mathematics & Physics, University of Hamburg (1981)
Answered Mar 2, 2018
First exercise in mathematics: add correctly. 50% of A plus 50% of B plus 50% of C make 150%, not 100.

Then: that is way too formalistic. Formulas play a much smaller role in math, than most laypeople actually believe. Algebraic calculation is a basic skill needed for most of math, and some are better than others, but it is not a central capability that constitutes a mathematicians. Personally I always had the impression, that for example theoretical physicists were much better at formula calculations than me and my math colleagues.

Frank SMS
15 Hilarious Quotes About Math
FrankSMS.com July 16, 2018
(...)
15. Mathematics is made of 50 percent formulas, 50 percent proofs, and 50 percent imagination
~ Unknown

Did they just miss the whole point? Or is that the whole point? Does this mean whatever answer we come up with is the right one? Yes, let’s go with that.