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Oct 17, 2026 7 min

Order of Arithmetic Operations: PEMDAS

from Professor Dave Explains Hosted by Professor Dave Explains

Sometimes there are expressions that contain a number of different arithmetic operations. But how do we evaluate these? Left to right? Right to left? Does it matter? Someone make a decision! Well, someone did, and we have a strict algorithm that tells us the order in which we evaluate arithmetic expressions. It's an acronym, and acronyms are fun, so this will be fun!Watch the whole Mathematics playlist: http://bit.ly/ProfDaveMathClassical Physics Tutorials: http://bit.ly/ProfDavePhysics1Modern Physics Tutorials: http://bit.ly/ProfDavePhysics2General Chemistry Tutorials: http://bit.ly/ProfDaveGenChemOrganic Chemistry Tutorials: http://bit.ly/ProfDaveOrgChemBiochemistry Tutorials: http://bit.ly/ProfDaveBiochemBiology Tutorials: http://bit.ly/ProfDaveBioEMAIL► [email protected]► http://patreon.com/ProfessorDaveExplainsCheck out "Is This Wi-Fi Organic?", my book on disarming pseudoscience!Amazon: https://amzn.to/2HtNpVHBookshop: https://bit.ly/39cKADMBarnes and Noble: https://bit.ly/3pUjmrn Book Depository: http://bit.ly/3aOVDlT

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Order of Arithmetic Operations: PEMDAS

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