Order of Operations (PEMDAS/BODMAS) Reference
By Dr. Iris Vaughan, Mathematics Editor·Published 1 August 2025·Last reviewed 20 February 2026
The complete order of operations with worked examples, the equal-precedence left-to-right rule, and the fraction-bar grouping rule.
Key Formulas
P/B: Parentheses/Brackets first
E/O: Exponents/Orders
M and D: left to right
A and S: left to right
Fraction bar groups numerator and denominator
Adjacent equal-precedence: always left to right
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