PEMDASBODMASsääntönä

PEMDASBODMASsääntönä refers to the combined use of two common mnemonics that describe the order of operations in arithmetic: PEMDAS and BODMAS. The acronym PEMDAS comes from Parentheses, Exponents, Multiplication, Division, Addition, and Subtraction, and is widely used in North America. BODMAS, used primarily in Britain, South Africa, and some other English‑speaking regions, stands for Brackets, Orders, Division, Multiplication, Addition, and Subtraction. Both represent the same hierarchy: parentheses or brackets first, then powers or orders (exponents or roots), followed by multiplication and division (performed left‑to‑right), and finally addition and subtraction (performed left‑to‑right).

In many Finnish educational settings the phrase "PEMDASBODMASsääntönä" is employed to emphasize that these symbols are interchangeable in teaching contexts and that the core principle remains the same. The rule is also applied in non‑English languages, where the letters may be replaced by local terminology while preserving the sequence of operations. The use of the combined mnemonic helps to prevent confusion when students encounter both versions in textbooks, research papers, or online calculators. It is consistent with the international convention of evaluating nested operations first, then handling multiplication/division before addition/subtraction, which ensures unambiguous interpretation of mathematical expressions.