Definitions from Wiktionary (napkin math)
▸ noun: (Canada, US) The act of performing quick mathematics often as a means of estimation, as if done on the back of a napkin (or in one's head).
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▸ noun: (Canada, US) The act of performing quick mathematics often as a means of estimation, as if done on the back of a napkin (or in one's head).
Similar:
math,
new math,
mathesis,
mathematicality,
mental arithmetic,
numberwork,
mental calculation,
nome,
innumeracy,
Napier's bones,
more...
Opposite:
▸ Words similar to napkin math
▸ Usage examples for napkin math
▸ Idioms related to napkin math
▸ Wikipedia articles (New!)
▸ Words that often appear near napkin math
▸ Rhymes of napkin math
▸ Invented words related to napkin math