I Don’t Let LLMs Do Even Simple Math (And You Shouldn’t Either)
Last Updated on August 28, 2025 by Editorial Team
Author(s): Dulan Jayawickrama
Originally published on Towards AI.
I Don’t Let LLMs Do Even Simple Math (And You Shouldn’t Either)
Ever wondered why your trusty AI buddy flubs even the simplest math? I sure did. Last week I discovered a bug in an AI service I was working on: users could ask, “What’s my total usage in the past month?” Then we have to add 30 values, but our AI kept miscalculating the sum.

The article discusses the unreliability of large language models (LLMs) in performing even simple arithmetic calculations, as demonstrated through the author’s experiences with a faulty AI service. It offers two solutions to bypass the limitations of LLMs: first, by having them write Python scripts for calculations which users can execute, and second, by utilizing a calculator tool that the LLM can call to perform arithmetic tasks safely. The author emphasizes the importance of safety and accuracy, advising users not to place their trust in LLMs for numerical computation.
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