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Index/People/Florian Cajori

Florian Cajori

American mathematician (1859–1930)

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Jan 14, 2026
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How does PEMDAS differ from BODMAS and when does that matter?

PEMDAS and BODMAS are regional mnemonics that encode the same underlying order‑of‑operations principle—do grouping symbols first, then exponents/orders, then multiplication and division (as a pair, le...

Jan 15, 2026
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Why does PEMDAS place multiplication before addition—historical and mathematical reasoning?

The convention that multiplication is performed before addition—memorably encoded in PEMDAS—grew out of the needs of algebraic notation in the 1600s and was later formalized in school textbooks as par...