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.

This article highlights the unreliability of large language models (LLMs) when it comes to performing even simple arithmetic calculations. The author shares a personal experience of encountering this issue, leading to the discovery of practical solutions to ensure accurate results. By either having the LLM generate a Python script for calculations or providing it with a calculator tool, users can circumvent the shortcomings of LLMs, resulting in precise calculations and avoiding mistakes.
Read the full blog for free on Medium.
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