"Mahajan describes six tools: dimensional analysis, easy cases, lumping, picture proofs, successive approximation, and reasoning by analogy. Illustrating each tool with numerous examples, he carefully separates the tool—the general principle—from the particular application so that the reader can most easily grasp the tool itself to use on problems of particular interest. Street-Fighting Mathematics grew out of a short course taught by the author at MIT"
That short course looks like its still available on edx - though it's archived - I seem to be able to access the material.
That short course looks like its still available on edx - though it's archived - I seem to be able to access the material.
https://www.edx.org/course/street-fighting-math