A "human calculator" is a term used to describe an individual with exceptional mathematical abilities, often possessing the capacity to perform complex mathematical calculations quickly and accurately in their mind without the need for external aids like calculators or computers. These individuals typically exhibit a profound aptitude for mental arithmetic and numerical problem-solving. Key characteristics of a human calculator might include: 1. Speed: They can perform calculations rapidly, sometimes even faster than a conventional electronic calculator. 2. Accuracy: Human calculators make very few, if any, errors in their calculations, demonstrating a high degree of precision. 3. Mental Math: They are adept at performing calculations mentally, without the need for pen and paper or digital tools. 4. Mathematical Fluency: These individuals often have a deep understanding of mathematical principles and can apply them effectively. 5. Versatility: Human calculators can work with a wide range of mathematical operations, from basic arithmetic to more advanced calculations involving algebra, calculus, and more. 6. Memory: Some human calculators possess remarkable memory capabilities, allowing them to remember extensive sets of numbers and perform calculations on them. 7. Showmanship: In some cases, human calculators may showcase their skills in public performances or competitions, adding an element of entertainment to their abilities. It's important to note that the term "human calculator" is often associated with exceptional mathematical prodigies or savants. While many people can improve their mental math skills through practice and training, true human calculators possess a rare and innate talent for mathematics.